It is an extract from Anacyclus pyrethrum, or Spanish chamomile. No, it is not a pro hormone, nor do they claim that it raises testosterone. As far as its method of action, I don't think anyone really knows at this point. But reviews I've seen for it have been pretty unanimously positive, and it's from a company that puts out decent products. Ultimately it's up to you if you want to put your faith in a product that's not very well understood, but seems promising.