You have to take tests every few months or so to make sure it’s working all right, but other than that it seems to be working well. I have much more energy now and I don’t feel as weak. I’ve noticed an increase in my sex drive, but since I’m single, that’s more of an inconvenience than a benefit. LOL. Anyway, make sure you take it the way they say. Don’t put on your clothes until it dries. I made that MISTAKE.