I've been taking it for two month's now, and I find that cycling the dosage has been very effective in keeping the "kick" at maximum levels. For example, the first few days I ran 4 caps, then went to 5 (I weigh 290, give or take). On non-workout days I'd take only two or three for general energy, and then repeat. I'm still getting the great focus and energy today that I did on day 1.
Good luck w/ you training and enjoy the .