Dayum,is strong. I tried 1 sample serving and I thought my heart was going to come out my arse lol. Focus was real noticeable, I actually did not care what music was playing on my ipod, its was pretty neat. The pumps were too much for me, I could not lift as heavily as normal due to severe pumps all over my body. I recommend starting off with a half of a serving, and work your way up accordingly. Also stim abusers, be careful, I found this to be more stimulating than 1,3 filled supps.