I was wondering the same thing about that ingredient but didn't think I knew enough to post that. On the other hand, isn't Aromasin a type II steroidal AI and it's the best AI for pct imo.
Yeah, its also a steroidial AI, and I dont usually recommend them for PCT. (unless you are running hCG)
Checkout my PCT article -
http://www.elitefitness.com/forum/anabolic-steroids/official-pct-2009-a-642825.html
-Eric