Nutrameltz Natural Collagen 150 mg is an all-natural eggshell membrane composed of Collagen, Hyaluronic acid, Glucosamine, Chondroitin sulphate and Elastin, the key biomolecules to maintain healthy joints and tendons. Collagen gives the body structure. Hyaluronic acid improves movement. It is high in sulfur, essential for strong and healthy bones.