As far as the Ephedrine, Caffeine, Aspirin and L-Carnitine capsules go, I'd say I like those a little too much. I'll take one or two every couple days. I don't go on and off really. Just whenever. It honestly feels as if they improve all around quality of life. I feel more awake, happier, energetic. I've taken too much, and felt (funny enough) like a rabbit being hunted. That's probably due to the Norepinephrine 'fight-or-flight' response. I'll even take some of these instead of going out and drinking if I have to be the designated driver.