Hyaluronic acid is a compound present in every tissue of the body, with the highest concentrations occurring in connective tissues such as skin and cartilage.* Hyaluronic acid is an important constituent of joint fluid, where it serves as a lubricant and plays a role in resisting compressive forces.* MSM was added to this product as a natural sulfur compound, offering the chemical links needed to form and maintain connective tissues in the human body including articular cartilage.*