This product is sold at veterinary offices and has over 700 five star reviews. Im not a rep for the company, I'm just putting it out there as an alternative. Personally, I do not believe that anything made for the pet market has any higher quality ingredients than the stuff made for humans. Human glucosamine supplements are just as good for dogs and cost less. If you want to make sure you are getting top quality ingredients, give your dogs human glucosamine + MSM supplements. Don't take it from me, you can research it on the internet or ask your vet