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What's the Difference Between Vitamin D and D3? | HaleGenic
Photo: Ryan Edwards-Crewe A vitamin can be defined as a substance that is all of the following (a) soluble in either water or fat; (b) needed to maintain life but does not supply energy; and (c) a deficiency of which may result in various diseases. An deficiency example would be scurvy, which results from a deficiency of …