i have heard that those are shit. Personally I don't know, and all the other IP prods I've tried are working great. I have credible sources that say those aren't good.
It's methyl d.h.t. Seeing as I'm already hairy where I don't want to be (hair everywhere but my head), suffering from male pattern baldness, and in mortal fear for my prostate, I think I'll avoid it. lol.