I trust this product because it has been recommended for years by Tina's alternative vet to help manage symptoms of osteoarthritis and improve her quality of life. At age 14, she is still a happy dog. She has some stiffness but, all things considered, good range of motion which is partly due to Health Concerns Mobility 2. Tina's vet graduated from an accredited, highly regarded vet school, but she has also offered alternative vet services for the past 15-20 years. I buy from the Simplify Life program because it helps me to follow our vet's recommendations while taking advantage of Only Natural Pet's lower prices.
Tiffy (13 year old collie mix) seems more active since she has been taking this. I just put it in her food. She also gets the vitamins with glucosamine/chondroitin.