What is ergocalciferol?

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Ergocalciferol is a form of vitamin D. Your body makes this important nutrient when your skin is exposed to the sun. Some foods such as fish contain small amounts of vitamin D. Other foods are fortified with added vitamin D. Getting enough vitamin D, either from your diet or with supplements, is essential for calcium absorption and strong bones. New research suggests that vitamin D may lower your risk for other diseases, too.