Got a sample of this with one my orders. It came with two capsules so I took 1 pill two days in a row. First day I took it around 2:00 and it had me wired for the rest of the day. Mind was racing, great energy and focus, and a unique euphoric feeling. It took me forever to fall asleep that night, probable since I took it in the afternoon. Second day I took it the feeling wasn't as intense. Gave me energy and focus but not like the first day. All in all if you don't mind the 1,3 dimethyl than I would recommend it. Not a bad product.