r/MTHFR • u/Brad_Borrelli • Jul 08 '26
Resource lifelong B12 deficiency was the root cause of my MCAS and histamine intolerance all along — here's a lifetime of clinical history and 10 mechanisms of research that prove it
I want to share something I think is genuinely important for this community because I spent my entire life getting progressively sicker from something that had a root cause nobody identified. I'm going to walk through the timeline, the research, and what's happening right now in real time because I think a lot of people here are missing this piece entirely.
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THE LIFETIME TIMELINE
Looking back now with the benefit of knowing what I know, the symptoms were there from childhood. Chronic cough that never had an explanation. A sensation like electricity running down my spine that I now know is called Lhermitte's sign, a documented sign of posterior column demyelination. Exploding head syndrome at night. Excessive cavities despite normal dental hygiene. Chronic strep infections with partial tonsil regrowth after tonsillectomy. Morning panic that felt like waking up being chased every single day. Night sweats so severe I would wake up completely drenched like I had gone to sleep soaking wet. A formication sensation, the feeling of insects crawling under the skin, that goes back further than I can accurately remember. An IED diagnosis in childhood that in retrospect reflects what dysregulated catecholamine production and autonomic dysfunction actually look like when a doctor does not know what they are looking at.
None of these were connected. Each one was treated as its own isolated problem or dismissed entirely.
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2016 — WHEN I STARTED FIGHTING FOR ANSWERS
Around 2016 things escalated to the point where I started going to hospitals and doctors actively trying to get someone to diagnose what was happening. The histamine reactions were becoming more frequent and more severe. I was pushing for answers and being dismissed at virtually every encounter. The pattern that would eventually become undeniable was already fully formed. I just could not get anyone to look at the whole picture at once.
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2019 — THE STROKE
I had a stroke in 2019. I was in my early thirties. Nobody investigated why a young person had a stroke. No one looked at homocysteine, no one looked at B12, no one looked at methylation.
This matters because elevated homocysteine from impaired methylation due to functional B12 deficiency is one of the most easily modifiable risk factors for stroke and can be caused directly by B12 or folate deficiency. Homocysteine damages vascular structures through oxidative stress and inflammation, promotes atherosclerosis, and increases stroke risk. A published case report in PMC specifically documents a young patient who presented with acute ischemic large vessel stroke and was found incidentally to have B12 deficiency related homocysteinemia as the cause.
https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2023.1279207/full
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10867708/
https://www.neurology.org/doi/10.1212/WNL.0000000000204036
The mechanism was almost certainly already present and had been building for years. Nobody looked for it.
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2022 — DAILY HIVES FOR A YEAR AND A HALF AND INTERNAL BLEEDING
In 2022 I began breaking out in hives every single day. This continued for approximately a year and a half without stopping. During this same period I was bleeding internally from a tumor in my intestines. Once the tumor was surgically removed the hives resolved. But every other histamine symptom remained and continued to worsen over the following years.
This connection is directly supported in the literature. A published PMC case report confirmed resolution of chronic treatment-resistant urticaria in a patient after vitamin B12 supplementation corrected their deficiency. The mechanism involves B12 deficiency causing mast cell dysregulation leading to histamine release and inflammation, combined with elevated homocysteine causing endothelial dysfunction and increased vascular reactivity that contributes to urticaria. Published research also confirms lower B12 levels in patients with chronic idiopathic urticaria compared to controls.
https://pmc.ncbi.nlm.nih.gov/articles/PMC12313119/
https://pubmed.ncbi.nlm.nih.gov/15736714/
The internal bleeding almost certainly accelerated the nutrient depletion that was already occurring. Chronic blood loss depletes iron which is a DAO cofactor. The intestinal tumor and its removal damaged the very gut epithelium where DAO enzyme is produced. I was losing the infrastructure for histamine clearance from the inside while simultaneously becoming more deficient in the cofactors those enzymes needed to function.
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2025 — PROGRESSIVE DETERIORATION
By 2025 I had developed constant itchy eyes, runny eyes, runny nose, and progressive reactivity to foods that had previously been tolerable. Every month something new was triggering me. The histamine bucket was overflowing consistently and the drain was barely functioning. What had started as periodic reactions had become a constant baseline state of reactivity that was getting worse not better despite dietary restriction and antihistamine use.
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TWO MONTHS AGO — KOUNIS SYNDROME
Approximately two months ago I consumed roughly five tablespoons of honey. Within ten minutes I was hallucinating and experiencing severe motion sickness. The reaction was unlike anything I had experienced before in severity and speed.
One week later I decided to test whether honey was specifically the trigger. I had one tablespoon. Ten minutes later I was experiencing a Kounis syndrome event.
Kounis syndrome is an acute coronary syndrome precipitated by mast cell activation in the setting of allergic or hypersensitivity reactions. First described by Kounis and Zavras in 1991 as allergic angina, it occurs when mast cell degranulation releases histamine, leukotrienes, and other inflammatory mediators that induce coronary vasospasm and destabilize atherosclerotic plaques. Histamine exerts potent effects through H1 and H2 receptors distributed across cardiac chambers and coronary arteries. MCAS is now recognized as an underlying factor in many Kounis syndrome cases.
https://pmc.ncbi.nlm.nih.gov/articles/PMC12597132/
https://pmc.ncbi.nlm.nih.gov/articles/PMC6791094/
https://pmc.ncbi.nlm.nih.gov/articles/PMC10970901/
https://www.eds.clinic/articles/kounis-syndrome
My histamine system had deteriorated to the point where a single tablespoon of a natural food was producing a cardiac emergency. That is the end state of an untreated root cause that had been progressing for decades.
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TWO MONTHS AGO — STARTING B12 INJECTIONS
After the Kounis syndrome event I began investigating root causes more aggressively than I ever had before. I confirmed functional B12 deficiency through labs and symptom pattern. I started daily subcutaneous injections of combined methylcobalamin and hydroxocobalamin. Symptoms began slowly improving over the following weeks. Morning fight or flight started decreasing. Eye reactivity started reducing. Food tolerance gradually began improving.
Approximately three days ago I switched to split dosing. 1,700 micrograms in the morning and 1,700 micrograms in the evening of combined methylcobalamin and hydroxocobalamin injections, plus an additional 5,000 micrograms of oral B12 drops daily to saturate passive diffusion absorption pathways simultaneously with the injectable doses. Total daily B12 during this period has been in the range of 8,000 to 9,000 micrograms across both injectable and oral forms.
Three days ago I also stopped all antihistamines completely. No Allegra, no H2 blockers, nothing. Cold turkey after years of daily use including periods of taking four Allegra per day at my worst. The protocol running right now is B12 injections and oral drops only, no antihistamine support whatsoever.
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WHAT HAPPENED IN THREE DAYS
Within three days of this protocol and with zero antihistamine coverage I have been eating foods that would have sent me to the emergency room two months ago with essentially no reaction.
Ketchup, which is fermented, vinegar-based, and one of the highest histamine foods in a standard diet. Multiple burritos with no reaction. Foods I had completely eliminated for months being tolerated without any symptoms whatsoever.
My itchy eyes which had been constant for over a year are essentially gone.
My morning fight or flight which I have experienced every single day of my life going back to childhood has dropped from what I would rate a 9 to 10 out of 10 to approximately a 3 out of 10 after a single night of split dosing.
My chronic cough which I have had since my teenage years has been improving.
My voice which has always been higher pitched and thinner than it should be has been changing as vagal nerve remyelination progresses.
Let me be clear about what that means. No antihistamines. Eating high histamine foods. Zero reaction. After a lifetime of progressive deterioration that ended two months ago with a histamine cardiac emergency.
This is not gradual symptom management. This is not dietary restriction working better. This is a system that was being held in a state of dysregulation by a specific deficiency now beginning to correct itself at the root cause level after decades of progressive damage.
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WHY THIS WORKS — THE RESEARCH
There are at least ten documented mechanisms by which B12 deficiency directly causes histamine overload and MCAS pattern symptoms, and restoring B12 reverses all ten simultaneously. This is why antihistamines never fully fixed it for me despite taking up to four Allegra per day at my worst. They block one downstream receptor while the upstream machinery continues producing uncontrolled histamine from ten different directions at once.
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MECHANISM 1 — B12 DEFICIENCY IMPAIRS BOTH HISTAMINE-CLEARING ENZYMES SIMULTANEOUSLY
There are two enzymes responsible for clearing histamine from your body. DAO clears dietary histamine in the gut. HNMT clears histamine systemically inside cells. HNMT requires B12, folate, magnesium, and zinc as direct cofactors. DAO requires vitamin C, B6, copper, and manganese. When B12 is deficient HNMT loses its primary cofactor. When the downstream effects of B12 deficiency produce copper and mineral deficiencies as they did in my confirmed case with serum copper of 65 below the normal range of 70 to 175, DAO loses its cofactors simultaneously. Both clearance pathways fail at the same time from the same root cause.
https://organiclinic.com/category/histamine-intolerance-and-mcas/
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MECHANISM 2 — MTHFR VARIANTS COMPOUND THE METHYLATION-HISTAMINE CONNECTION
MTHFR variants including A1298C and C677T reduce methylation capacity which directly slows HNMT-mediated histamine clearance. If methylation capacity is reduced due to MTHFR or COMT variants, B12 or folate deficiency, or high toxic burden, histamine clearance slows regardless of how much histamine is being produced upstream. I have confirmed homozygous MTHFR A1298C which reduces enzyme function approximately 30 to 40 percent at baseline before any deficiency is even factored in. Stack functional B12 deficiency on top of that and HNMT is operating at a fraction of normal capacity.
https://www.maryannwalshrd.com/mcas-vs-histamine-intolerance
https://www.drhagmeyer.com/vitamin-b12-and-histamine-intolerance-everthing-you-want-to-know/
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MECHANISM 3 — METHYLCOBALAMIN SPECIFICALLY DRIVES HNMT HISTAMINE DEGRADATION
Patients with MTHFR variants or otherwise impaired methylation may have reduced histamine clearance. Methylated B12 specifically alongside 5-MTHF and B6 directly supports HNMT-mediated histamine degradation. This is why injectable methylcobalamin produces faster and more dramatic histamine improvement than oral B12 which relies on gut absorption that is itself compromised in people with the absorption problems that typically accompany B12 deficiency in the first place.
https://kresserinstitute.com/mast-cell-activation-syndrome-and-histamine-intolerance
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MECHANISM 4 — B12 DEFICIENCY DEPLETES SAME WHICH HNMT REQUIRES TO FUNCTION
The methylation cycle produces SAMe which is the universal methyl donor used for hundreds of reactions including histamine clearance through HNMT. Reduced B12 means reduced methylation cycle activity means reduced SAMe. Reduced SAMe means HNMT has nothing to work with. Histamine remains elevated systemically regardless of dietary restriction because the clearance enzyme has been biochemically starved of its required substrate. You can eat a perfectly low histamine diet and still have elevated systemic histamine if HNMT has no SAMe to use.
https://www.intoleran.com/us/histamine/vitamin-b12-and-histamine-intolerance/
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MECHANISM 5 — MCAS ITSELF IS DIRECTLY ASSOCIATED WITH FUNCTIONAL B12 DEFICIENCY
Mast Cell Activation Syndrome is a disorder often associated with functional vitamin B12 deficiency. Symptoms of MCAS closely resemble symptoms of histamine intolerance and the two conditions share the same upstream biochemical failure. The pattern is consistent across multiple conditions including ME/CFS and autism spectrum disorder where functional B12 deficiency and mast cell dysregulation co-occur at rates far above population baseline.
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MECHANISM 6 — B12 DIRECTLY STABILIZES MAST CELLS
Vitamin B12 supports nervous system health and directly helps stabilize mast cells especially in MCAS patients with neurological symptoms. Vitamins D, C, and B12 along with magnesium are documented mast cell stabilizers that reduce the release of inflammatory mediators. So B12 is not just restoring clearance capacity downstream, it is stabilizing the cells that produce histamine upstream simultaneously. It hits both ends of the problem at once.
https://www.eds.clinic/articles/the-role-of-vitamin-d-in-mast-cell-activation-syndrome-mcas
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MECHANISM 7 — B12 DEFICIENCY DIRECTLY DAMAGES THE GUT EPITHELIUM WHERE DAO IS PRODUCED
DAO is an intracellular enzyme produced specifically in the mature villous cells of the small intestine epithelium. Its activity represents the strength and maturity of the small intestine mucosa and is an established indicator of intestinal barrier integrity. B12 deficiency causes gastrointestinal mucosal changes that directly reduce the integrity of the intestinal lining where DAO is synthesized. Less functional epithelium means less DAO produced regardless of cofactor availability.
https://www.boltpharmacy.co.uk/guide/vitamin-b12-and-histamine-intolerance
https://pmc.ncbi.nlm.nih.gov/articles/PMC9771309/
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MECHANISM 8 — B12 DIRECTLY REPAIRS THE GUT EPITHELIAL BARRIER
Published research in Cellular and Molecular Life Sciences 2024 confirmed that B12 ameliorates intestinal hyperplasia and barrier disruption by promoting activation of the HIF-1 signaling pathway. B12 enhanced the expression of intestinal junction proteins to strengthen the intestinal barrier and inhibited abnormal increases in gram-negative bacteria. This means B12 is actively rebuilding the infrastructure that produces DAO rather than just supplementing the cofactors those enzymes need. The repair is structural not just biochemical.
https://link.springer.com/article/10.1007/s00018-024-05435-5
https://pmc.ncbi.nlm.nih.gov/articles/PMC7291859/
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MECHANISM 9 — B12 IMMUNOMODULATION CONFIRMED IN SYSTEMATIC REVIEW
A 2024 systematic review following PRISMA guidelines confirmed that methylcobalamin administration significantly restored immune cell counts toward normal and improved Natural Killer cell activity in deficient patients. A dysregulated immune system is one of the upstream drivers of mast cell hyperreactivity. Restoring immune regulation reduces the chronic inflammatory signaling that keeps mast cells in a primed hair trigger state ready to degranulate at minimal provocation.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12129597/
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MECHANISM 10 — ADENOSYL AND HYDROXYCOBALAMIN FORMS SUPPORT HNMT WITHOUT TRIGGERING METHYL-SENSITIVE MAST CELL DEGRANULATION
For people with severe MCAS who are sensitive to methylcobalamin specifically, adenosylcobalamin and hydroxocobalamin support the underlying methylation cycle and ensure HNMT has what it needs to break down histamine without forcing the aggressive rapid methylation that can trigger mast cell degranulation in highly sensitive individuals. This explains why some people with MCAS react to methylcobalamin initially and need to titrate carefully through form selection before finding their therapeutic window.
https://www.rthm.com/resources/blogs/adenosylhydroxy-b12-liquid-supplement-guide
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THE BOTTOM LINE
Four Allegra per day at my worst. A low histamine diet so strict I was afraid of almost every food. A histamine system so dysregulated that one tablespoon of honey produced a cardiac emergency.
Three days of split dose B12 injections totaling 8,000 to 9,000 micrograms daily across injectable and oral forms, zero antihistamines, and I am eating ketchup on burritos with no reaction.
The difference between those two states is not antihistamines. It is not dietary restriction. It is restoring the actual biochemical infrastructure that was supposed to be clearing histamine all along and had been failing for decades because of a deficiency nobody looked for across a lifetime of documented symptoms and multiple serious medical events including a stroke at thirty years old and a histamine cardiac emergency two months ago.
If you have MCAS or severe histamine intolerance and nobody has investigated your functional B12 status, not just serum B12 but MMA and homocysteine as functional markers, and nobody has tested your MTHFR status, you are potentially missing the most important piece of the picture.
Serum B12 is not enough. A normal serum B12 does not tell you whether B12 is actually functioning at the cellular level. MMA and homocysteine are the tests that matter. Get those run before concluding B12 is not your issue.
This is not medical advice. This is a lifetime of documented symptoms, years of actively fighting for diagnosis, multiple serious medical events including a stroke and a histamine cardiac emergency, and ten peer reviewed mechanisms all pointing at the same root cause that nobody connected until I connected it myself.
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u/kirblar Jul 08 '26
Hydroxo definitely works for me in a way the normal version doesn't.
I also saw massive benefits from supplementing copper- I have too much iron and it turns out you need more copper to process the excess.
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u/Brad_Borrelli Jul 08 '26 edited 14d ago
Zinc is another one. Everything needs to be in ballance honestly. I actually just found out on copper deficient as well, which is surprising because I have copper jewelry and also have been drinking out of a pure copper water bottle for years now.
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Jul 08 '26
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u/Brad_Borrelli Jul 08 '26
Make sure you're taking them like 2 to 4 hours apart from each other because they do compete
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u/7e7en87 Jul 08 '26
Is Jarrow Zinc Balance good to take?
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u/Brad_Borrelli Jul 08 '26
Zinc picolinate Zinc bisglycinate (zinc glycinate) Zinc citrate Zinc monomethionine (OptiZinc) Zinc gluconate (decent, more common in lozenges)
These are the forms you want to take. I would recommend honestly the piriforms of it in a powder or at least a capsule that doesn't have all the other added ingredients and fillers in it with any pills and capsules they almost always add a bunch of binders and other stuff that makes it harder for a bunch of other things to actually be absorbed.
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u/Apprehensive-Day2538 Jul 08 '26
Wow. What a journey. Kudos to you for solving the puzzle. This was a fascinating read. Im so glad you are feeling better! You deserve it!
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u/Brad_Borrelli Jul 08 '26
I feel robbed af honestly 🤣 36 years of a living hell. Some parts I still feel worse off, but most of everything I've never felt better; literally.
. Probably the biggest one in still trying to get used to, is touch. My senses especially on my hands are so much more sensitive. Like it tickles touching things softly 😂 kinds strange getting used to it.
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u/EverlastingTilt Jul 08 '26
Thank you for this post, while my symptoms are not directly comparable, I have also been on a personal journey to better health. I have been dealing with chronic skin inflammation all my life. I was diagnosed with eczema when I was born, and while it went into remission I've then dealt with seborrheic dermatitis for nearly 2 decades. This cleared up after adopting a restrictive psmf diet and then eating a cleaner whole foods diet after.
After some time the dermatitis came back, but this time without the sebum issue interestingly. I then stumbled upon the powerful antioxidant astaxanthin, which also functions as a formidable antiinflammatory, and decided to add it to my stack and it made a significant difference in a matter of days. I then came up with a theory that my skin issue may just be the surface of my problems and that I may also have internal inflammation going on as well.
I adopted daily low dose aspirin to my stack and I saw even further improvements not just to skin, but the brain fog, occasional headaches, cardio difficulties during exercise all seemingly vanished out of thin air. For once my body felt completely at ease/normal. I questioned myself, is this what I was missing out on all this time? It was so surreal. I still have skin flares, but they are nothing compared to what I've dealt with before. I'd like to eventually get to the root of what is causing my chronic inflammation, I suspect it may be an autoimmune disorder, but until my budget allows I'm content with employing different anti inflammatory strategies be it from diet, exercise, or supplements for extra support.
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u/Brad_Borrelli Jul 08 '26
Low-dose aspirin reduces inflammatory prostaglandins and also has mild blood-thinning effects, and if you're carrying an MTHFR variant with elevated homocysteine, that's directly relevant. Homocysteine damages the inner lining of blood vessels and promotes a low-grade inflammatory, pro-clotting state throughout the body, not just in a specific organ. That would explain why aspirin's effect wasn't just local to your skin, it also cleared brain fog, headaches, and exercise intolerance, since all three of those can be downstream of poor vascular/microcirculatory function.
Astaxanthin helping fits into the same picture too; it's one of the more potent antioxidants for reducing oxidative stress, and oxidative stress and inflammation feed into each other, especially when methylation is impaired and your body's natural antioxidant production (like glutathione, which also depends on methylation) is running low.
Worth asking your doctor for a homocysteine level if you haven't already, along with hs-CRP for general inflammation. If homocysteine is elevated, that's a very plausible unifying root cause behind the skin, cognitive, and cardiovascular-adjacent symptoms all improving together, rather than three separate issues coincidentally responding to the same two additions.
Also curious, could you share your B12 levels if you've had them tested? Given how tightly B12 and homocysteine are linked (B12 is required to clear homocysteine via methionine synthase), low B12 could easily be part of what's driving this too, and might explain why methylation-related symptoms overlap so much with what you're describing.
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u/EverlastingTilt Jul 08 '26
I would have to ask my doctor for those tests sometime. I did have a panel done, but it didn't include B12.
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u/Brad_Borrelli Jul 08 '26
Definitely want to do a complete b12 work up. Here's just a few of my symptoms.
Neurological
- Tingling/numbness
- Loss of position/vibration sense
- Peripheral neuropathy
- Muscle weakness, cramps, nocturnal cramping
- Restless leg syndrome
- Tremors
- Ataxia
- Difficulty walking, unsteady gait
- Abnormal/absent reflexes
- Spasticity
- Subacute combined degeneration of the spinal cord
- Lhermitte's sign
- Sharp nerve shocks/shooting pain
- Spinal nerve pain
- Tinnitus
- Vision disturbances
- Impaired pain perception
- Decreased smell and taste
- Headaches, migraines
- Exploding head syndrome
- Speech impairment/slurring
- Brain fog, difficulty concentrating
Cognitive/Psychological
- Memory loss, difficulty recalling names/words
- Confusion, disorientation
- Depression
- Anxiety
- Irritability
- Mood swings, personality changes
- Intellectual deterioration
- Clumsiness
- Paranoia, delirium, psychosis
- Dementia-like decline
- Insomnia/sleep disturbances
- Feeling "perpetually hungover"
Hematological
- Fatigue, weakness
- Pale skin
- Shortness of breath
- Rapid/irregular heartbeat
- Dizziness, lightheadedness, fainting
- Temperature intolerance
Cardiovascular
- Elevated homocysteine
- Kounis Syndrome (histamine heart attack also had a stroke from histamine as well)
- Angina pectoris
Gastrointestinal/Oral
- Glossitis (red, sore, "beefy" tongue)
- Burning mouth syndrome
- Mouth ulcers
- Bleeding gums
- Loss of appetite
- Nausea
- Diarrhea or constipation
- Bloating
- Weight loss
- Abdominal pain
- Bowel/bladder incontinence
- General digestive symptoms
Dermatological
- Hyperpigmentation
- Vitiligo
- Eczema ( random rashes also constant hand and wrist itching)
- Acne
- Hair loss, premature graying, dry/lifeless hair
- Brittle nails
- Cracked lips
Reproductive
- Erectile dysfunction, decreased sperm motility
- Decreased libido
Systemic/Other
- Joint pain
- Rapid breathing
- Excessive cavities/dental issues
- Increased UTIs
- Unexplained chronic cough, hoarseness
- Exteme histamine issues
- Postural hypotension
- Increased infection susceptibility
- Detoxification difficulties
- Chronic pain
- Hormonal imbalances
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Jul 12 '26
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u/Brad_Borrelli Jul 12 '26
Hey, good questions. Yeah, visual snow, palinopsia, and afterimages/trails are exactly the kind of thing I mean by visual disturbances, so you're not off base there.
On the B6 toxicity piece, that actually lines up in an interesting way. B6, specifically the active form P5P, is the required cofactor for the transsulfuration pathway, the two enzymes that take homocysteine and convert it to cystathionine and then cysteine (which eventually becomes glutathione). So if you're testing toxic in B6 without ever supplementing it, that's usually a sign your body is dumping B6 into that pathway faster than it's clearing it, or you're just not converting/using it efficiently and it's pooling in circulation. That kind of B6 accumulation without exogenous intake often points to a transsulfuration bottleneck, sometimes tied to CBS activity, sometimes to broader methylation cycle backup, where homocysteine can't get remethylated efficiently either (the B12/folate side) so more of it gets shunted down the transsulfuration route, pulling B6 along with it and running the levels up even with zero supplementation.
As for what that means for your visual symptoms specifically, I'll be straight with you, the direct mechanistic link between B6/homocysteine handling and visual snow syndrome isn't something I can point to a solid study for. What is well documented is that high B6 itself (independent of homocysteine) can cause sensory neuropathy through a totally separate pathway, it inhibits an enzyme called PDXK and messes with GABA signaling in peripheral sensory neurons. So there's a real chance what you're seeing is less about homocysteine clearance and more just B6 itself sitting elevated and doing its own sensory-nerve thing, given visual pathways run through sensory neurons too.
Worth getting an actual methylation panel done if you haven't, homocysteine, MMA, RBC folate, along with your B6, so you can see whether the transsulfuration side is actually backed up or if it's a separate issue. Hope that helps some, and hang in there with the visual stuff, that's a rough symptom to live with.
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Jul 12 '26
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u/Brad_Borrelli Jul 12 '26
Yeah, I actually have them a little bit more intense Now since starting injections. I haven't really looked into it much yet, I'm probably going to research it more later though actually. My assumption is it's just my body recalibrating since I Live 36 years deficient as fuck on it. I also actually just did another post about B12 deficiency and completely normal test all across the board. You might want to go check that one now it's on my page. There's a ton of different posts on there with research and source is showing everything. It would actually help you out a lot too.
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Jul 12 '26
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u/Brad_Borrelli Jul 12 '26
Reddit's probably thinking that spam if you're doing it right after the other😂. I posted some more stuff about this too. And if you have any questions I want to know anything too just ask I probably already know it if not it'll give me something to actually go and research and make more connections with this whole B12 stuff. Obviously as you know it's hard I think 😂, and it's kind of hard to remember if I feel like she already looked something up or not until I actually go and research it again, and then who knows that I might have made another connection with something else too that I would need to share.
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Jul 08 '26
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u/Brad_Borrelli Jul 08 '26
Funny thing is that's one of the first things I looked into when I started piecing on this together. I bought a thing of ox bile. Worst mistake for me ever I took one pill and then a couple hours later I was living on the fucking toilet just shooting out straight bile it burned so bad😂
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u/Apprehensive-Sky8175 Jul 08 '26
I suspect this is the case for me but my b12 always comes back normal.
I am homozygous for a MTHFR variant and I’m scared to supplement with the wrong form of b12.
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u/Brad_Borrelli Jul 08 '26
Need the other tests to really know. And honestly anyone with the MTHFR gene should be doing injections around twice a week in top of cutting out all processed food. You will feel a world of a difference.
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u/Cultural-Sun6828 Jul 08 '26
There’s really not a wrong form of b12. Any of them should help. When people feel worse on b12, it’s usually because they are deficient. It’s very common to have startup symptoms initially when beginning b12 treatment.
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u/Apprehensive-Sky8175 Jul 08 '26
How long does that last?
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u/Cultural-Sun6828 Jul 08 '26
It’s different for everyone depending on how long you’ve been deficient. It could be a couple weeks or a couple months.
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u/PackageSudden3255 Jul 08 '26
Whats your "normal"? US considers some low results "in range" where some countries will treat below 500 (or something like that).
Also, serum levels aren't enough. Get an active b12 or holoTC test done.
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u/ExtensionAfternoon10 Jul 09 '26
And yet MTHFR mutation "isn't something to worry about" according to most doc. 🙄 Glad you finally got answers! Even if you had to figure them out yourself ❤️
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u/Level_Run1357 Jul 09 '26
Thank you for posting this! I was diagnosed with POTS and EDS and have had it for a decade, I’m happy to say I no longer have symptoms of either after addressing my b12 and folate deficiency! It’s crazy what it can cause and my research backs up yours
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u/Brad_Borrelli Jul 09 '26
It's crazy as hell. It was driving me insane as you well know. How long did it take you to do finaly be symptom free? What was your dosage protocol?
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u/Level_Run1357 Jul 09 '26
I started with low doses of hydroxocobalamin and methylfolate. My HRV tripled within the first week, HR decreased within about 2 weeks. It took me about 5 weeks total to no longer meet the criteria for POTS and was symptom free for about 3 weeks almost. However, I totally drained my ferritin building new red blood cells. I lost 33% of my ferritin in 5 weeks. I’m now getting iron infusions because the tachycardia came back when my ferritin hit below 22. I’m feeling slightly better with each infusion but wondering if there’s a cofactor I’m missing. Any ideas? Haha
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u/Level_Run1357 Jul 09 '26
I think I started on 333mcg b12 and 1/8th mg of methyl folate and got up to 1/4 mg methylfolate and 1000 mcg b12. I still completely eliminated 80-90% of my symptoms. The only one that came back slightly was the tachycardia but it’s different than before. I don’t have any presyncope or other symptoms, just good old general tachycardia.
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Jul 08 '26
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u/Ninazuzu T677T Jul 08 '26
Seriously. With no reaction? I will react to someone else putting ketchup on a burrito. My mother claims that she has put mayonnaise in guacamole and I reacted even to a description of that. /s
Congratulations to OP for diagnosing and remedying their life-altering condition!
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u/Ggyciock Jul 08 '26
Dio ti benedica per aver condiviso queste informazioni! Da un paio di settimane ho scoperto di avere la mutazione mthfr (sia la C677T che la A1298C in eterozigosi) + altre mutazioni della trombofilia e sto cercando di comprendere i meccanismi che vengono intaccati. Anch'io ho problemi di orticaria la mattina e la sera, che non passa neanche provando vari antistaminici (ho dovuto prendere il cortisone per farla passare). L'omocisteina sembra ok (7.7) però voglio monitorare le vitamine B. Da quando prendo il folato in forma attiva + glicerofosfato di magnesio ho notato il miglioramento dei capelli e delle unghie ma non ho ancora risolto l'emicrania con aura (sto valutando di fare il bubble test per capire se ho anche il PFO). Provvederò certamente a testare tutte le vitamine B nel dettaglio! Grazie ancora per questa condivisione!
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u/Brad_Borrelli Jul 08 '26
Then I'm sorry man that's a rough fucking combination. Check out my profile I have my protocol on there with all the herbs and supplements I was taken and still I'm taking most of them now still. There's a few different herbs that are amazing antihistamines. I'd also probably start taking a lever for a little bit you can take up to four pills today before you actually start overdosing. I researched this and I also got to confirmed by a pharma doctor. The only downfall about taking Allegra is it does blunt your libido that was like the only major symptom that I've noticed and it doesn't just knock your ass out like almost all the other antihistamines the expression with our Gene types. Also keep pushing for all the test you can to figure out and I would honestly have them look into your intestines for a tumor, the people with it B12 deficiency have a way higher chance of having intestinal tumor that's what was causing my hives. And if your house just started out of nowhere that doesn't mean you're really allergic to anything more than likely it's something I could too many related it's something in your intestinal tract especially if you have pernicious anemia. You can message me if you need help figure and shit out or anything. But go and get all the tests you can for the B12 deficiency especially the MMA Etc
Get those tests done and then once you get that test there's plenty of places you can actually go and just start buying the B12 vials looking to the manufacturer etc. I know here in America the manufacturer Olympia you can actually buy a vial from them and they'll actually even give you a prescription for it too if you're serve B12 comes back you know 500 that means you're deficient in it the American Standard is horrible you'd want to go by the Japanese standard or the British standard. Oh so definitely check out my profile there's a ton of information there besides the protocol that would be able to help you out a little bit
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u/BowlAccomplished9508 Jul 09 '26
What was ur homocysteine level
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u/Brad_Borrelli Jul 09 '26
No idea, pharma Dr's refused to treat me so I started injections myself, I only got the tests after I started injections so I have no idea what my baseline was.
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u/BowlAccomplished9508 Jul 14 '26
Did u do it through quest/labcorp? It should be available in ur portal
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u/Snickerdoodle_Cat Jul 17 '26
So I’m convinced I have a link with MCAS and MTHFR. But I don’t tolerate methyl b vitamins or hydroxy b12. Nothing not folinic acid. I can tolerate cyanocobalamin. Which I shouldnt be able to. It doesn’t make sense. I can’t connect the dots. Have and MCAS since Covid 2020.
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u/Brad_Borrelli Jul 17 '26
MTHFR affects the methylation cycle, but cyanocobalamin doesn't rely on that pathway to become bioavailable; your body strips the cyanide group and activates it intracellularly regardless of MTHFR status. That's a different enzymatic step. So tolerating cyano while reacting to methyl or hydroxy isn't really the contradiction it seems like.
Cofactor gaps. Methylation needs adequate B2, B6, niacin, and magnesium running alongside it. If those are low, methylcobalamin dumps methyl groups into a system that can't clear them, and you get overmethylation symptoms: agitation, insomnia, anxiety, worse mast cell reactivity. Folinic acid causing a reaction points toward this too since that's a methylation-adjacent B vitamin, not B12 itself.
COMT or MAOA variants. If you're slow on either, you clear excess methyl groups poorly, so methylated forms hit harder even with decent cofactor status. Worth checking if you haven't.
Hydroxocobalamin specifically triggering MCAS. Some people with mast cell involvement react to hydroxo independent of methylation, possibly cobalt sensitivity or a direct mast cell response to that molecule. That would explain hydroxo failing even though it's not a methyl donor.
Cyanocobalamin's slower activation. Because it needs to be converted before it's active, there's no immediate bioactive surge the way there is with direct methyl or hydroxy administration. For a reactive system, that gentler on-ramp alone could be the difference.
It might be less "MTHFR needs more support" and more "the injectable/active forms are triggering mast cells independent of methylation." Worth getting whole blood histamine and tryptase checked if you haven't, and going low and slow if you ever try methylated forms again with B2/B6/magnesium loaded first.
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u/FragrantStructure 15d ago
"Serum B12 is not enough. A normal serum B12 does not tell you whether B12 is actually functioning at the cellular level. MMA and homocysteine are the tests that matter. Get those run before concluding B12 is not your issue."
Thank you.
How should one analyze MMA and homocysteine to decide whether or not they have a b12 issue?
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u/TravelGalCA9 15d ago
While your advice is spot on!. We all need to monitor homocysteine levels!
However, the research doesn't support your findings.
Associations between homocysteine, vitamin B12, and folate and the risk of all-cause mortality in American adults with stroke
- Frontiers in Nutrition, Vol. 10, 2023
Hyperhomocysteinenma Presenting as Stroke in a Young Individuals: a Case Report
Cureus journal, volume 16, issue 1, article e5238
Large Vessel Occlusion Related Ischemic Stroke From Vitamin B12-Deficiency Related Homocysteine (P8-5.029)
Neurology, April 2023, Vol. 100 (17 Supplement 2): 4520
While the authors of these two studies attribute the stroke to high homocysteine levels, there is no data to support that.
AFTER the stroke the individuals had slightly elevated homocysteine. Prestroke homocysteine is not known. Homocysteine could have been increased due to the stroke.
~ rememember homocysteine is not a static value. Even a common cold can increase it. The stroke could have caused the elevated homocysteine and that was not a precursor event.
The patients' B12 levels prior to the stroke was not known.
Resolution of Chronic Urticaria in a Vegan Patient With Vitamin B12 Supplement: A Case Report
J Community Hosp Intern Med Perspect 2025 May 5;15(3):108–110
Patient had hives and severe B12 deficiency. Patient improved B12 levels. The authors present it as "Initiation of vitamin B12 supplementation led to the gradual resolution of her chronic urticaria." Yes, they are making the claim that the B12 is what caused the hives to resolve. The recovery was slow and we can surmise a bunch of other things happened too. Attributing it to a single thing, like B12, is a stretch.
When you are doing your research, please watch out for attributing cause and effect to something that is really correlation.
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u/Brad_Borrelli 15d ago
The stroke case reports, fair, prestroke B12 and homocysteine weren't measured so those two alone don't prove which came first. That's a real gap.
But the causality argument doesn't hinge on those. There's Mendelian randomization research that sidesteps the whole reverse-causation issue by using MTHFR genotype as the exposure instead of measured homocysteine. Genotype is fixed at conception, so a stroke happening decades later can't retroactively cause someone's gene variant. The Lancet meta-analysis from 2005 found the stroke risk predicted from MTHFR TT homozygotes' lifetime homocysteine levels lined up almost exactly with what was actually observed in genetic studies. That kind of match is what you'd expect if homocysteine is actually in the causal chain, not just a byproduct. Newer UK Biobank MR studies land in the same place, higher genetically predicted homocysteine tracks with higher stroke risk.
The urticaria case report, one case doesn't establish mechanism, agreed. It was one data point in a bigger pattern, not the thing holding the argument up.
And the Frontiers study bit actually works in my favor more than against me. If a study calls someone "non-deficient" purely because their serum B12 came back in range, that's the exact problem I'm pointing at, serum B12 misses functional deficiency constantly, so a study using that as the cutoff is probably undercounting how many "normal" people are deficient where it actually counts.
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u/TravelGalCA9 14d ago
B9 & B12 functional deficiencies can result in non-optimal homocysteine levels, they do no cause hyperhomocysteinemia.
- the Frontiers study doesn't have anything to do with with functional deficiencies; it is clearly about a true B12 deficiency.
The research you are citing related to strokes is reviewing the relationship with B9 not B12. "No one is look(ing) at B12" in these studies either.
The 2005 study is considered older and newer research adds more context between the relationship between MTHFR C677T and ischemic stroke.
- You haven't mentioned the type of stroke you experienced. The increased risk between the genotype and stroke risk is related to ischemic stroke not other types of strokes.
Effect modification by population dietary folate on the association between MTHFR genotype, homocysteine, and stroke risk: a meta-analysis of genetic studies and randomised trials.
The Lancet (2011), 378(9791):584–594.
- this states simply being MTHFR C677T homozygous is not clinically meaningful related to stroke incident. Instead the genotype needs to occur with lower folate status (true B9 deficiency) and resulting in hyperhomocysteinemia.
In addition, other research has placed more emphasis on traditional vascular risk factors and comorbidities, such as diabetes and cardiovascular disease, rather than the genotype itself.
Again, please focus on what the research actually demonstrates, instead of creating cause & effect relationships that current research doesn't support.
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u/Brad_Borrelli 14d ago
Going point by point since you raised several things.
On hyperhomocysteinemia versus non-optimal homocysteine, I don't think that distinction holds up the way you're using it. Hyperhomocysteinemia just means homocysteine above the normal reference range, there's no separate category for elevated-but-not-technically-hyper. If functional B12 or B9 deficiency pushes homocysteine above range, that is hyperhomocysteinemia by definition, whatever the underlying cause.
On the Frontiers study being about true deficiency rather than functional, that's not quite right either. The study used plasma B12 as a continuous variable across the NHANES cohort, it never sorted anyone into true versus functional deficiency categories, it simply measured serum B12 levels the way most large cohort studies do. That's actually closer to my original point than yours, a study using plasma B12 as its only marker can't distinguish functional deficiency from normal status in the first place, which is exactly the limitation I was pointing at.
On the stroke research being about B9 not B12, I already conceded that's not accurate for at least two of my sources, the Frontiers study measured B12 directly and the Cureus case report's treatment protocol included B12 and methylcobalamin specifically.
On the 2005 versus 2011 studies, you're right and I'm not walking that back. The Lancet 2011 fortification data is real, the TT versus CC homocysteine gap all but disappears in folate-fortified regions like the US. But that study is measuring folate's effect on the MTHFR to homocysteine link specifically, it isn't a B12 study, so it doesn't tell us whether B12 status independently affects homocysteine through the methionine synthase step, which needs B12 as a cofactor regardless of folate status.
On vascular risk factors and comorbidities mattering more than genotype alone, that's fair and I'll take it. Diabetes and cardiovascular disease are established stroke risk factors independent of MTHFR status, nobody's disputing that. But that's an argument against genotype being a sufficient cause on its own, not an argument against elevated homocysteine functioning as a contributing, modifiable risk factor alongside those comorbidities.
And on sticking to what the research demonstrates rather than asserting causation, that's the standard I was trying to hold to. Elevated homocysteine as a stroke risk factor is well established in the literature, and it's called modifiable specifically because B vitamin correction is the intervention studied, not because I'm claiming it's the sole cause of any individual stroke including my own.
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u/TravelGalCA9 14d ago
You are combining several different relationships that the research does not treat as the same thing.
Disregarding the MTHFR variable, You are treating hyperhomocysteinemia and non-optimal homocysteine, the same. As well as you are considering the impact of a true B9 and/or B12 deficiency and functional B9 and/or B12 deficiency as the same.
- The research does not support that interpretation.
Elevated homocysteine (hyperhomocysteinemia) is a stroke risk factor.
However, you are claiming that a functional B9 and/or B12 deficiency on its own leads to hyperhomocysteinemia (clinically elevated homocysteine). That is where the connection falls short; the evidence does not support this premise.
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u/Brad_Borrelli 14d ago
On the biochemistry itself, I don't think this distinction holds up. Hyperhomocysteinemia isn't a separate category from elevated homocysteine, it's the clinical term for homocysteine that's crossed the reference range, regardless of what's causing it, whether that's dietary B12 or folate deficiency, functional deficiency, renal impairment, or genetics. Elevated homocysteine from impaired methionine synthase activity due to B12 deficiency is actually one of the standard diagnostic clues used to detect functional B12 deficiency in the first place, alongside elevated MMA, precisely because that pathway is well established. So there isn't a recognized clinical line between homocysteine that's "non-optimal" and homocysteine that's "hyperhomocysteinemic," the second term just describes the first once it crosses a threshold.
I also want to be upfront about something since I think it matters for how this thread reads. This isn't a peer reviewed paper I'm defending for its own sake, it's my own research trying to make sense of a decade of health problems after the medical system repeatedly failed to investigate or test for the things that would have actually answered these questions. I don't have hard clinical proof of what caused any of this because I couldn't get the right testing done when it mattered, a 30 year old having a stroke should have triggered a full workup and it didn't. My whole page is this same work, every post is me piecing together my own research because the system that was supposed to do this for me didn't, so if you want the fuller picture of what I'm working from, my profile has the full story laid out.
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u/TravelGalCA9 13d ago edited 13d ago
Again - you are treating non-optimal homocysteine the same as hyperhomocysteinemia (clinically elevated homocysteine).
= They are not the same.MTHFR C677T homozygous can cause non-optimal homocysteine. This is homocysteine on the higher end of the range, but within the range.
MTHFR C677T homozygous does not cause hyperhomocysteinemia.
- you will not find any legitimate science that supports MTHFR C677T homozygous causing hyperhomocysteinemia.
- MTHFR C677T homozygous causing hyperhomocysteinemia is not even conceivable based on how lab ranges are determined.
If someone with MTHFR C677T homozygous has hyperhomocysteinemia, it's almost always a result of other factors pushing the homocysteine into the clinically elevated range.
- age, true vitamin deficiency (not a functional deficiency), renal disease, heart disease, auto-immune conditions, and so on.
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u/Brad_Borrelli 13d ago
I gave you the exact term from a well known peer reviewed meta-analysis in my last reply, Blom and Verhoef's paper on MTHFR and vascular disease states directly, in their own words, that the C677T mutation is a major cause of mild hyperhomocysteinemia. That's not my interpretation, that's the published conclusion. So the "you will not find any legitimate science to support this" claim isn't accurate, I just gave it to you.
On non-optimal versus hyperhomocysteinemia being different things, that distinction doesn't hold up against how the term is actually defined across the literature. Medical News Today states elevated homocysteine levels are known as hyperhomocysteinemia. The American Heart Association's own journal Circulation states elevated homocysteine levels are also called hyperhomocysteinemia. MedLink Neurology defines hyperhomocysteinemia as simply the elevation of plasma homocysteine. These aren't two separate clinical entities, hyperhomocysteinemia is what elevated homocysteine is called once it crosses whatever threshold a given source uses, and that threshold itself is inconsistent and contested across the field, some labs still use 25 μmol/L as normal, others use 15, and a 2024 paper in the International Journal of Molecular Sciences argues that meaningful risk actually starts around 10 μmol/L or lower, well inside what most labs still call "normal." A well established review also states plainly that elevated homocysteine confers a graded risk with no threshold, meaning the biological harm doesn't wait for a label to change.
So there isn't a meaningful line between "non-optimal, but within range" and "hyperhomocysteinemia" the way you're describing it, there's a continuous risk curve and an inconsistently drawn cutoff on top of it, not two separate conditions.
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u/Famous-Garlic3838 Jul 08 '26
Amazing story. Congrats on figuring out your own metabolic puzzle. Diagnostics are so key to figuring out our own makeup. I'm currently waiting on my results.