Thanks for bringing this to my attention. I had a patient who was a racehorse owner with terrible arthritis.

He had noticed the amazing effect it had on his animals and had somehow managed to convince the vet that looked after his racehorses to let him have " a couple of extra vials" in case they lost some. 
He swore he was a new man since injecting himself with Cartrofen and was convinced there was some big pharma conspiracy as to why it wasn't available to humans!

id completely forgotten about it til now!

EDIT: This is in no way an endorsement of this drug, and absolutely not a suggestion to start injecting yourself with equine products. Furthermore anecdotes are in no way proof.  This was just a funny story I thought I'd share!