Mega-Flx + HA Equine - 32 ounce Indicated for horses experiencing joint pain and muscle soreness. Adds 150 mg/oz hyaluronic acid to the already potent and patented combination of selenium and vitamin E for muscle problems and key nutrients and antioxidants proven effective for joint problems. Combines the fast relief of HA and MSM to the long term lameness improvement of our proprietary Flx 4 functional antioxidant and selenium absorption systems.