I've used
Powerfull before, good stuff in my opinion. At
one time you could buy it in bulk, but it wasn't as concentrated as the new stuff that you have. Never got around to trying the new stuff.
Seemed to take a while to kick in so give it some time, but once it did it was decent. Strength definitely went up.
Try to take it at the same times each day for consistency. I think I did an early morning upon waking and before eating dose, to about 9 hours later 1 hour before workout and 1/2 hour before my preWO shake. And a night time dose I think....its been awhile. Just stay consistent as you can on your timing.