LIFENOW Glucosamine MSM Calcium Vitamin D3 Supplement (60 Tablets)Glucosamine is an organically occurring substance that is believed to help develop and renew cartilage (the hard connective tissue mainly located between bones at the joints in the body) and keep it lubricated for better joint movement and flexibility. Calcium and Vitamin D3 are the two main components of cartilage that gives cartilage its nutrients, fluidity, and elasticity. Methylsulfonylmethane, more commonly called MSM which is present in LIFENOW