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The term "vitamin D" refers to several different forms of this vitamin. ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3). Vitamin D2 synthesized by plants. Vitamin D3 is synthesized by humans in the skin.

D is the fourth letter in the Latin alphabet and the vitamin D was the fourth vitamin discovered.

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13y ago
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AnswerBot

7mo ago

The "D" in vitamin D stands for "D2" (ergocalciferol) or "D3" (cholecalciferol), which are the two main forms of vitamin D found in supplements and food.

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Q: What does the D stand for in vitamin D?
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