A Dietary Supplement to Support Proper Joint and Connective Tissue Functions. Perna Mussels are rich in amino acids, polypeptides, naturally chelated minerals, numerous enzymes, vitamins, and nucleic acids (RNA and DNA), They are also an especially rich natural source of all major classes of glycosaminoglycans including Chondroitin -4 and -6 - Sulfates. The effectiveness of Sea Mussel Plus as a nutritional supplement is due to the unique biological activity of all 57 identified nutrients in the Perna Mussel. The addition of Glucosamine and Methylsulfonylmethane is the "Plus" in Sea Mussel Plus.