A year ago my black 10yr old lab had his second acl surgery.  I had him on glucosamine  chondroitin & MSM since then.   He did improve, but because he is 10, I wanted more quality of life for him.  Two weeks ago, I started him on the Glycanaid HA.   I see an even bigger improvement.  He can  jump and stand on both back legs.   It may cost more but worth it to see him active.  Thanks for a great product!