Yeah, I can't speak to its use for long periods, but for a one off I just felt in the zone and able to concentrate, and then when straight to sleep when finishe

Yeah, I can't speak to its use for long periods, but for a one off I just felt in the zone and able to concentrate, and then when straight to sleep when finished. I don't think I took a particularly high dose. The second time I took it was for an athletic competition to give me focus. It worked well, but I don't think it lasted the whole day.