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Vitamin D is a fat-soluble vitamin (meaning it is dissolved in fat) that is produced internally by the body when ultraviolet rays from the sun hit the skin. There are two forms of vitamin D produced by living creatures: D-2 and D-3.  Vitamin D-2 is produced by invertebrates, fungus and plants. Vitamin D-3 is produced by human bodies.  Therefore vitamin D-3 is generally the most commonly recommended since it is the one our bodies produce.