Hyaluronan (also called hyaluronic acid or hyaluronate) is a non-sulfated glycosaminoglycan distributed widely throughout connective, epithelial, and neural tissues. Hyaluronan is naturally found in many tissues of the body such as skin, cartilage, and the vitreous humor. Hyaluronan is a major component of the synovial fluid and was found to increase the viscosity of the fluid. Along with lubricin, it is one of the fluid's main lubricating components. Hyaluronan is also a major component of skin, where it is involved in tissue repair. When skin is excessively exposed to UVB rays, it becomes inflamed (sunburn) and the cells in the dermis stop producing as much hyaluronan and increase the rate of its degradation1. Since hyaluronic acid is a component of skin, connective tissue, and neural tissues, the only food I can think of would be just that-- those parts of an animal. It is generally not thought of as a food product. You may be thinking of a different acid.

1. http://en.wikipedia.org/wiki/Hyaluronic_acid

J. W. Kuo has written:

'Practical aspects of hyaluronan based medical products' -- subject(s): Biocompatible Materials, Chemistry, Hyaluronic acid, Therapeutic use

Hyaluronic acid, which is also known as Hyaluronan, is a polymer made up of disaccharides. The disaccharides are formed by D-N-acetylglucosamine and D-gluceronic acid. These are linked together through alternating glycosidic bonds.

Hyaluronic Acid (Hyaluronan) is injected directly into the knee joint as a treatment for the pain in the knee associated with osteoarthritis. This treatment is normally reserved for those patients who have not responded to the traditional treatments for osteoarthritis pain.

Hyaluronic acid ( also known as hyaluronan or hyaluronate) is an anionic, nonsulfated glycosaminoglycan. In nature it is found in connective,epithelial, and neural tissues. It

Medically may be used in speeding up the healing of wounds. It is also used in cosmetics