Label reads:
Each capsule contains:
100% Bulgarian Tribulus..........750 mg
(Tribulus Terrestris L.)
Naturally contains over 45% steroidal saponins
United States Patent No. 6,343,258
Meets Bulgarian state standard specification # ON 0273062-81
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Sounds like you got that stuff at bb.com? I'm ordering mine from BAC, their stuff is standardized for 15.6% protodiocin, which is the active component you're looking for.
Seems that alot of guys take 1000mg/day for PCT