B-12
My bottle of b-12 sublingual dots (from walmart, 500mcg), 240 pills was, oh, about 4 bucks.

FatGirlShrinking.com , my blog :-)
I hope Fred is being funny! I read that the body can have too much B6 because it doesn't shed what it doesn't need, but that B12 is shed if not needed. I take 2500mcg in a drink called zipfizz every afternoon and it keeps my "on my toes" for 6 hours (www.zipfizz.com). I was previously taking 150 mcg as a daily sublingual without this noticable difference. So I guess if you need B12, supplements work, and if you don't, you won't feel anything because you'll shed it.