Supplements, ergogens, nootropics, etc.

Anyone here mess around with ergogens or nootropic type supplements to enhance cognition/performance (physical or cognitive)? Personally, I am a fan of them. Curious who else has used these during school, and to hear your thoughts and experiences. Things like creatine monohydrate, l-citrulline, beta-alanine, etc. for exercise performance. Racetams, choline derivatives, ALCAR for nootropics, etc. Discuss. Inb4 adderall jokesters...
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums