Very good. Bought it because my dog fell down a flight of stairs in his excitement and was limping for a few days. After I gave this HA to him, he could walk as per normal and jump around after two days. Don't know if it was his natural recovery or the effects of the HA. But I have read alot about HA and trust that it does help the joints and can be absorbed into the body. However, I must say that it is an expensive purchase. Wish it could be cheaper since oral HA for humans are so much cheaper.