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What is vitamin D? Originally credited with helping the body with calcium and bone metabolism, more recent studies show that vitamin D has many other influences on keeping the body healthy. It is thought of as a prohormone more than just a vitamin because it is only after D3 is metabolized in the liver and then into other forms in the kidneys that the active forms are produced. To date, some thirty-seven forms of Vitamin D3 have been isolated and chemically characterized. Continue reading