check out this web site http://www.buzzle.com/articles/vitamins-help-treat-acne.html
also this is not a vitamin, but I found that drinking apple cider vinegar (from the health food store) about a shot worth mixed in tomatoe juice each day helps my acne – it cleans your body of all impurities. Good Luck

What about brewer's yeast pills?

You can try Prevaderm..a natrual supplement that helps removing your acne:
http://www.marketamerica.com/24hoursmall/index.cfm?action=shopping.uoProduct&prodID=1352

If you can, go to a doctor and see about getting birth control pills. However, if you smoke, you will risk the chance of a stroke. Do not smoke if you are taking birth control pills.

I use aloe vera on my skin for my spots that i get as its very good for the skin and it helps my spots all i did was get an aloe vera plant which was about 4.98 from a garden centre and i cut a little bit off it and wash my face then spread it over my face before bed time it helps spots you should try it !!

Eat a lot of green vegetables like spinach, cabbage, beans, peas, lettuce, etc. A salad and fruit should be taken daily. Check out http://useinfo-acne.blogspot.com/ for more useful info.