i took novedex xt and it took me about 1.5-2 weeks before it really kicked in. but when it did i had energy like never before. i wanted to stay in the gym all day, i felt like i could lift forever. it gave me some pretty decent strength gains too, and it also helped me sleep better. my only side affect was a slight bit of anger every now and then, but that part i enjoyed haha. it is very potent stuff, and one of the best things from gaspari in my opinion.