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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
Vitamin B3 could help reduce skin cancer risk. A new study could change the way doctors treat patients at high risk for skin cancer. It doesn't involve any high-priced new pharmaceuticals -- the key may be an over-the-counter vitamin supplement that costs less than $10 a month. Researchers found that a form of vitamin B3 called nicotinamide could help reduce the chance of skin cancer recurring in patients who've had it before. (Another popular form of Vitamin B3 called niacin was not used in this study.)