Glyco Flex is a nutritional joint supplement for dogs throughout their lives. It is excellent for all ageing breeds that are predisposed to joint problems. It is made from pure freeze-dried Perna canaliculus (Green-Lipped Mussel from New Zealand). It contains all major classes of glycosaminoglycans (GAGs) including Chondroitin -4- & -6- Sulphates. GAGs are referred to as the "glue of life" & make up the core of all connective tissue. The Perna in Glyco Flex is also rich in amino acids naturally chelated minerals numerous enzymes vitamins & nucleic acids (RNA & DNA). Glyco Flex is an exceptional nutritional supplement for the maintenance of connective tissues including joints synovial fluid tendons ligaments & cartilage. Glyco Flex is a comprehensive line of joint support formulas from Vetri-Science featuring glucosamine green lipped perna mussels & their patented DMG. Glyco Flex II also contains MSM & Manganese & Glyco Flex III contains these & additional vitamins & antioxidants for maximum effect. Perna mussels are a good source of protein minerals & Chondroitin Sulphates. The Perna canaliculus used in Glyco Flex is produced by freeze-drying the entire mussel (excluding the shell) of the Perna Mussel from New Zeal&. You should carefully read all product packaging & labels prior to use.