I've had great luck with Acti-Flex 4000. It has ALL of the recommended ingredients, including HA, Yucca, MSM, Glucosamine, Chondroitin, etc., and the best part.... It's affordable!!! Bigdweb.com has the best price online. And if you buy a gallon, you get a qt free
With one of my horses, who has a definite hock issue, I have to feed extra MSM, a half-dose of a pure MSM supplement. But, straight MSM is cheap, only about $5-6 a month for the amount that I feed, in addition to the Acti-Flex.