I also started taking a vitamin B complex when I stopped drinking. I can see a noticeable difference to hair, skin, nails and mood swings though how much of this is down to NOT drinking and not necessarily a supplement is anyone's guess!!
I feel better and have read that vitamin B is depleted by alcohol so good for drinkers and ex drinkers to take it. If you google vitamin B complex and look at the wikipedia link it's very detailed.