first thing, is it the "new powerfull"? next, have u noticed better sleep at night? for me, at first 4 caps of the bulk powerfull would knock me out like a bat to my head, and i would have the groggy hangover the next day. but now, 4 caps is just perfect for me (best sleep i have ever had, an i always had trouble sleeping) but keep in mind that the bulk pfull i am using is the less concentrated "old version."