Glyco-Flex I for Cats is made from pure freeze-dried Perna canaliculus (New Zealand Green-Lipped Mussel). Perna contains all major classes of glycosaminoglycans (GAGs) including Chondroitin -4- and -6- Sulfates. GAGs are referred to as the "glue of life" and make up the core of all connective tissue. The Perna in Glyco-Flex I for Cats is also rich in amino acids, naturally chelated minerals, numerous enzymes, vitamins and nucleic acids (RNA and DNA). GLYCO-FLEX II FOR CATS Contains 300 mg of Perna for cats Maintenance of joint and connective tissue health Perna provides factors for rebuilding and protecting joints in cats For breeds predisposed to hip and joint dysfunction Chewable tablets for easy administration Available in a 45 count bottle.