i have spent the afternoon looking at websites re human drugs for dogs, all i can say is i was advised by an old vet years ago to treat old dogs this way and have always done so, and my dogs have always been okay on it, and all of them have lived into their mid to late teens, the old lab i have now on this treatment, eats well,looks well, still likes her little walk and i expect her to reach her 16th birthday in june. but please take your vets advise, not mine, i expect modern vets know a lot more than my old chap does.