What Does Ultra Joint Builder Do? Jarrow Formulas Ultra Joint Builder addresses total joint health by providing nutrients and botanicals that support proper cartilage formation, proper joint lubrication and a healthy inflammatory response within the joint. Hyaluronic Acid provides the matrix for joint lubrication (synovial fluid), skin hydration and skin repair. Hyal-Joint hyaluronic acid has clinically documented bioavailability, having been shown to increase synovial fluid and improve joint mobility. Glucosamine Sulfate is a stable form of glucosamine, which supports the proper formation of tendons, ligaments, synovial fluid, bones, skin, nails and blood vessels. Methylsulfonylmethane (MSM) is a sulfur donor; sulfur is essential for the formation of chondroitin sulfates. Yucca Extract contains the dried, pure juice of the yucca plant, which contains more naturally occurring saponins than the dried stalk. Yucca also contains polyphenols. Traditionally, Native Americans used the juice of the yucca plant to improve joint health. AprèsFLEX (Boswellia serrata extract, which includes a proprietary boswellia oleoresin component) is clinically documented to support joint health and function and protects against collagen degradation. Boron is essential for healthy bone and joint function. For best results, use with Jarrow Formulas JarroSil, the biologically Activated Silicon.