1 AD! don't know much about it but i know a few ppl who swear by it, if you mention it they turn their heads, one of my best friends actually ran it in high school, didn't know what it was, no pct, and recovered fine and swears the weight and strength gain on it was unreal....another kid i know says nothing out now comes close to it.....i could be wrong but it'd be nice to have a crack at it