Perna mussels are a good source of protein, minerals, and chondroitin sulfates. Along with Glucosamine, MSM and Perna canaliculus, GLYCO-FLEX III contains other ingredients such as N,N Dimethylglycine (DMG), Vitamins C and E, Selenium, Manganese, Grape Seed Extract and L-Glutathione. Vetri-Science holds 5 U.S. patents on DMG which demonstrates the multiple benefits that this ingredient can provide for the health and well- being of the dog. The Perna canaliculus used in GLYCO-FLEX III is produced by freeze-drying the entire mussel (excluding the shell) of the Perna Mussel from New Zealand.