Natural Flexâ¢ is a carefully formulated supplement and contains glucosamine, chondroitin, Perna mussel, manganese ascorbate and biotin to help support joint function for all classes of horses. This product uses a variety of ingredients to help maintain joint health in horses. Through a combination of proven components, this product helps maintain cartilage and connective tissue. It contains glucosamine, Perna mussel, manganese and in addition, chondroitin sulfate in an apple flavor that horses love. Glucosamine along with chondroitin helps to maintain synovial fluid that lubricates joints. Glucosamine is an easily absorbed natural substance that may stimulate the production of proteoglycans which help maintain the health and resiliency of joints and connective tissues. Extract of Perna mussel contains additional glucosamine and other compounds that help maintain joint mobility. Ascorbic acid is an antioxidant. Antioxidants help remove damaging free radicals. Manganese is a mineral essential to the formation of connective tissue (such as cartilage). Biotin, for keratin development essential in the hoof and in hair, is also found in the product. Together, the ingredients help maintain normal healthy joints, cartilage, and connective tissue. Research shows that these ingredients help support normal joint health and function for all classes of horses.