LubriSyn HA Plus with MSM for Equine & Pet Hyaluronic Acid is a naturally occurring component of joint fluid. It can only be supplemented by injection or by oral absorption. In studies, MSM (methylsulfonylmethane), has shown to relieve symptoms associated with osteoarthritis. These vital elements have come together to create LubriSynHA + for a natural, synergistic, anti-inflammatory effect. LubriSynHA Plus helps support your horse?s connective tissues, is a natural antioxidant, and assists equine muscle tissue rebound from exercise stress and soreness. Highest Molecular Weight HA Non-invasive Joint Support Fast Acting (7-10 Days) All Natural Ingredients Gluten Free BPA Free Made in U.S.A. LubriSynHA Plus Brochure for Canine. LubriSynHA Plus Brochure for Equine.