Reposting this because I posted it at the very end of the last open thread and hence, I think, missed the window for it to get much attention:

I'm vegetarian and currently ordering some dietary supplements to help, erm, supplement any possible deficits in my diet. For now, I'm getting B12, iron, and creatine. Two questions:

• Are there any important ones that I've missed? (Other things I've heard mentioned but of whose importance and effectiveness I'm not sure: zinc, taurine, carnitine, carnosine. Convince me!)
• Of the ones I've mentioned, how much should I be taking? In particular, all the information I could find on creatine was for bodybuilders trying to develop muscle mass. I did manage to find that the average daily turnover/usage of creatine for an adult male (which I happen to be) is ~2 grams/day - is this how much I should be taking?