glutamine

this was recomended to me be a bloke who goes to my gym, i was just wondering what is it and what does it do? cheers

Glutamine is a conditionally essential amino acid. That means that under periods of stress and exercise your body cannot produce it in large enough quantities. As mentioned above there is evidence to suggest that it is a useful supplement.

I also use it regularly, although I cannot vouch for its effectiveness from personal experience...