We've recently reduced the sale price down an additional 10% off. Buy now and save. GlycoFlex is a nutritional dietary supplement for dogs of all breeds throughout their lives. 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- and -6- Sulfates. The Perna in Glyco-Flex is also rich in amino acids, naturally chelated minerals, numerous enzymes, vitamins, and nucleic acids (RNA and DNA). Each chewable tablet contains 300 mg Perna canaliculus (Green Lipped Mussel). Ingredients: Perna canaliculus (Green Lipped Mussel), Brewer's Yeast, Alfalfa. Comparison between old and new formulas.