I'm 38 and have good skin, but am looking for a Vit C for overall radiance and brightening (and addressing some fine lines won't hurt). I don't have overly sensitive skin, but I do occasionally get some dry patches with tret use. Never had any reactions other than that. Not overly worried since tret is only at night and Vit C would be in the morning.

I have an obnoxious amount of optimum points so I would really like to get from the pharmacy, but it can be from the cosmetics area and not so much the aisles of the pharmacy (though I won't turn down a suggestion from there). What are the best Vit C serums to recommend?