NEM SAPJoint support (based on science) Natural eggshell membrane (NEM) is the thin membrane that forms the inner wall of chicken egg shells. It contains many ingredients known to help support joint health, including collagen, glucosamine, hyaluronic acid, glycosaminoglycans (GAGs), and chondroitin sulfate, as well as several other proteins and peptides. Studies have shown that NEM can improve symptoms of pain and stiffness associated with osteoarthritis