Sentinel Calcium Oyster Shell 500mg Plus Vitamin D is a dietary supplement containing 100 tablets that combines natural calcium from oyster shells with Vitamin D. Each tablet provides 500mg of calcium and 200 IU of Vitamin D to support bone health and calcium absorption. This supplement utilizes calcium derived from oyster shells, which is a natural form of calcium carbonate that is well-absorbed by the body. The addition of Vitamin D helps enhance calcium absorption and utilization. This combination is particularly beneficial for adults over 50, post-menopausal women, those with limited dairy intake, or individuals concerned about bone health. The supplement supports proper muscle function, nervous system health, and helps maintain strong teeth and bones.