... :keep the skin smooth and moist Hyaluronic Acid is found in all connective tissue, joints, body cavities, joint spaces, and tissue ... surfaces. The highest levels are found in the synovial fluid of all joints and the skin. There ... eyes, cartilage, heart, intervertebral discs of the spine and in the fluids of the inner and middle ear. Assay95%-105%99%HPLCPhysical ...