Coral, specifically "coral calcium," has been marketed as a dietary supplement primarily to support or treat calcium deficiency. The scientific justification for its use is based on the fact that coral calcium is a source of calcium carbonate, which is a compound that can increase dietary calcium intake. Calcium is essential for bone health, muscle function, nerve transmission, and vascular contraction. However, the evidence supporting coral calcium's superiority over other calcium supplements (such as calcium carbonate from limestone or calcium citrate) is weak. Multiple studies and reviews have concluded that, while coral calcium does provide calcium, it does not offer any unique benefit beyond what is provided by standard calcium supplements. Furthermore, there is limited data regarding the absorption, efficacy, or safety of coral calcium compared to more established forms. Major health organizations, such as the National Institutes of Health (NIH), do not specifically recommend coral calcium, and some regulatory agencies have taken action against misleading marketing claims. In summary, while coral calcium can technically be used to support calcium deficiency due to its calcium content, the scientific evidence does not support claims of unique efficacy or health benefits, and it should be considered equivalent to other basic calcium sources.