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Vitamin D3 is a fat-soluble vitamin that is naturally synthesized by the skin or ingested in the diet. It is used to maintain healthy bones and teeth, and plays a role in cell growth, immune function, and blood vessel health. Vitamin D3 can be taken orally as a supplement or obtained from foods such as fatty fish and fortified dairy products. The RDA for adults 19 years of age or older is 600 IU per day.