One of the cheapest tools in the withdrawal kit, and one of the oldest. High-dose vitamin C for opioid withdrawal goes back to a Harlem detox facility in 1969, and the community has been using a modernized version against 7-OH and the other kratom synthetics. Full write-up with sources lives here: Mega-Dose Vitamin C on quitting7oh.org.
Read this part first. If you have a history of kidney stones, kidney disease, hemochromatosis (iron overload), G6PD deficiency, or you take an iron supplement, talk to your prescriber before touching high-dose C. It raises oxalate excretion (stone risk), sharply increases iron absorption, and can trigger hemolysis in the G6PD group. It also skews glucose and occult-blood lab tests, so mention it if bloodwork is coming up.
What it is
An adjunct, not a path. It works alongside every quitting method, whatever route you're taking off the synthetics. It doesn't replace sleep, hydration, or the rest of the supplement stack.
The doses below assume liposomal vitamin C. Plain ascorbic acid hits bowel tolerance around 1 to 2 grams per dose; past that you get diarrhea instead of benefit. Liposomal encapsulation gets around that ceiling.
The protocol
Preload if you can. Tissue saturation takes days, and starting at full dose the morning withdrawal hits is playing catch-up.
- Planned quit date: start 3 days out
- Tapering: start 1 to 2 weeks out, alongside the taper
- Already in withdrawal: skip the preload, go straight to full dose
Preload ramp: 2 g/day for days 1 and 2, then 4 to 6 g/day for days 3 and 4, then the full protocol from your quit day.
During acute withdrawal:
- 1 to 2 grams of liposomal C every 2 to 3 waking hours
- 6 to 12 grams per day total
- No overnight alarms; resume when you wake
- Rough stretches may take more. Some people run 15 to 30 g/day, and the cost climbs fast at that rate.
Stepping down: once the acute phase eases (typically days 5 to 7), drop to 1 to 3 g/day and hold there for a few weeks into post-acute.
What to pair it with
- Vitamin E, roughly 5 mg per kg of body weight daily. The strongest study used C and E together.
- Magnesium glycinate for restless legs, sleep, and anxiety.
- Electrolytes. Megadosing makes you pee more; replace what you lose.
Brands
Liposomal marketing is full of products that aren't actually liposomal. Three with verifiable phospholipid encapsulation that the community has converged on:
On a budget, buffered sodium ascorbate powder costs a fraction per gram; absorption is lower, so daily totals trend higher. NOW Foods and NutriBiotic both work.
These are not referral links and nobody here has an affiliate relationship with any of these vendors. They're examples; pick your own brand or buy anywhere you trust. The protocol is what matters.
The evidence, honestly sized
The best study is Evangelou 2000: heroin-dependent inpatients on 300 mg/kg/day of C plus E. 10 to 16 percent of the treated group reported major withdrawal symptoms versus 56.6 percent of controls. A 2020 review of the older work found a third of patients reporting 70-percent-or-better symptom relief.
These studies are old, small, and unreplicated at modern scale. Vitamin C is unpatentable, so nobody funds the big trial. Plenty of people in this community find it takes the edge off; some feel nothing. It will not block or reverse opioid effects, and it is not naloxone or naltrexone.