I've read over the ingredients at the site, and that stuff is nothing more than a regular joint supplement. First time I've read of anyone claiming hormone replacement/enhancement with one though.
This one concerns me too:
http://www.biologicvet.net/products/biosport-for-the-active-dog/The Sport supplement contains creatine, and I just don't think that's a safe supplement without some close veterinary observance. Our vet wouldn't agree to it, and that's why I say that. It can cause all kinds of problems with dehydration--especially during the summer months.