Sentinel Calcium Oyster Shell 500 mg plus Vitamin D is a dietary supplement containing 100 tablets. Each tablet provides 500 mg of natural calcium derived from oyster shells, enhanced with Vitamin D for optimal absorption. This combination supports bone health, dental strength, and proper muscle function. This supplement is particularly beneficial for adults over 50, post-menopausal women, individuals with limited dairy intake, and those at risk for calcium deficiency. The calcium from oyster shells is in the form of calcium carbonate, which is well-absorbed by the body. The addition of Vitamin D helps improve calcium absorption and utilization. The product comes in a dark amber bottle to protect the tablets and maintain their potency.