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Vitamin DThis function of the vitamin is essential for building and maintaining healthy bones. Of note is that calcium, which is the main element in bones, can be absorbed by the body only when vitamin D is present. Both D vitamin and calcium are involved in many body functions, including keeping the immune and nervous systems healthy. From anti aging perspective, interesting is that in one study conducted by the University of California in San Diego, researchers reviewed 63 old studies and found that the vitamin could reduce the chances of developing breast, ovarian and colon cancer, in some cases as much as 50%. However, the study also acknowledged that large doses of vitamin D should be treated with caution, as damage to the liver and kidneys is possible. 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