Creatine

Naturally occurring in muscle tissue, creatine functions as a secondary reservoir for short-term energy to be drawn upon when ATP (adenosine triphosphate) stores--the energy storage molecule that drives muscular contraction--are depleted. Supplemental creatine monohydrate added to the diet will increase the concentration of creatine phosphate within muscle tissue which may increase one's ability to perform brief, high-intensity exercise.

see the Misc.Fitness.Weights FAQ: Supplements:Creatine

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If you are not a student, but know of a college student who lifts weights at a college near you, you can Nominate him to become a Campus Man. The student you nominate will be grateful someone "nominated" him because of his muscles!