Apple flavored Natural Flex Ultra NutriBitesâ¢ contain glucosamine and manganese along with added chondroitin sulfate. These ingredients help support normal joint health and function in 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, manganese and chondroitin sulfate. Plus, it is apple flavored, a 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. Manganese is a mineral essential to the formation of connective tissue (such as cartilage). Together, the ingredients help maintain normal healthy joints, cartilage, and connective tissue.