Osteo Bi-Flex Triple Strength + Magnesium tablets contain Glucosamine which helps nourish and strengthen joints, while helping to maintain joint cartilage essential for comfortable joint movement. Magnesium supports the contraction and relaxation of muscles and helps with leg cramps, a condition that occurs occasionally among adults with inadequate intake. This product also features the herbal ingredient joint Shield, shown through clinical studies to improve joint comfort within seven days!