This is by far the best pre-workout supplement on the market, totally insane. I give it a 10/10, half hour before workout , but dont take withing four hours of going to bed, good luck trying to sleep. Only one problem, it says dont take longer that 8 weeks without a break. I took it for 8 months, 20 days a month and it started to play with my hormones. Anyone else experience this? I have stopped taking it for about a month now so I think I will try it again. This is way better than Jacked 3d.