NOW Foods Eggshell Membrane is a unique biological matrix composed of major joint constituents, including chondroitin, glucosamine, hyaluronic acid, collagen and other proteins. NEM® (Natural Eggshell Membrane) is a patented Eggshell Membrane preparation that can help to maintain healthy articular cartilage and surrounding synovial tissue by nourishing joints, as well as by supporting a balanced immune response to typical daily wear and tear.