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Vitamin D is known as a fat-soluble vitamin, but is actually a group of fat-soluble secosteroids of which two, ergocalciferol and cholecalciferol, are important for humans. In the human body cholecalciferol can be synthesized from cholesterol in sun-exposed skin, hence its nickname “The Sunshine Vitamin.” Ergocalciferol can only be synthesized from plant sterols (phytosterols), but […]