Light microscope image of crystals of sodium hyaluronate which is the sodium salt of hyaluronic acid. It is a glycosaminoglycan found in the synovial fluid around the joints and in skin and the vitreous humor in the eye. It is used in the cosmetics industry as an anti-aging treatment, maintaining collagen levels and retaining moisture. It is also used to treat osteoarthritis. Magnification: x136 at 10cm wide.