Perna mussels are a good source of protein, minerals, and chondroitin sulfates. Along with Glucosamine, MSM and Perna canaliculus, GLYCO-FLEX II contains other ingredients such as Manganese and N,N Dimethylglycine (DMG). 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 II is produced by freeze-drying the entire mussel (excluding the shell) of the Perna Mussel from New Zealand .