Finish Line makes a product called Fluid Action HA, that can be purchased in liquid form. We use it on some of the older horses and the horses with joint problems, and have had really good luck with it in some of the ones with arthritis. Also most of the horses who show/ jump regularly are on a powdered MSN/ glucosimine suppliment. To make sure that it gets eaten instead of left in the bucket, all the horses get Beet Pulp that has been soaked in water with thier grain, it makes the powdered suppliments damp so they don't blow away, and it also helps with hydration.