Alpha Brain is a supplement created by OnNit Labs. It is a concentration & memory booster. I was sceptical at first, but in my experience, it has been great. I feel much more focused when taking it. And it's not only me, I know two other people currently using it as well. Go to onnit.ccom to check it out.
Tried it and liked it. But I was kind of disappointed with my results. Joe Rogan speaks of it in such a way, that I really had high expectations. All it did for me was make me wake up better. I could sleep 4 hours and still feel sharp as hell. No need for coffee, cold water, nothing. Just awake and functioning. I'm going to play with nootropics again soon.