Joint Fuel Liquid Concentrate contains Glucosamine, Chondroitin Sulfate, and SAMe (s-Adenosyl Methionine) Precursors such as Betaine (Trimethylglycine), Folic Acid, Vitamin B12 and Vitamin B6. It also contains Hydrolyzed Collagen Protein and Chicken II Collagen, the richest and most economical source of the amino acids Proline and Arginine. Proline is required for collagen synthesis and Arginine is a precursor of Nitric Oxide (NO). Nitric Oxide modulates tendon repair. A recent report in The Lancet (Vol. 352, July 25, 1998) suggests that it may help promote healthy tendons and help promote soft tissue repair.