Drinking alcohol regularly makes one malnourished, of especially vitamin C and B vitamins, Niacin especially. I've done quite a bit of reading on the subject and actually began mega dosing vitamins before I quit drinking and I'm sure my withdrawals were eased by this. In fact the founder of AA was a proponent of high doses of niacin to help with recovery. I suggest anyone struggling with addiction read his work, you can find links on Doctor yourself . com Please do not start mega dosing all at once, it can be unpleasant, I know I made that mistake
Don't believe the hype about high doses of vitamins, read the studies!!
The recommendation is to take vitamins to tolerance, there are physical signs to tell you when you're there. I've been doing this for months and what I noticed when I quit drinking was my tolerance level dropped by half. Proof enough for me. There is a great book called, the Vitamin Cure for Alcoholism, check it out.
Be well