Download cholecalciferol vegan10/6/2023 In addition to making vitamin D in our skin, we can also obtain D3 from certain animal foods, such as beef liver, cheese, egg yolks, and fatty fish. Vitamin D3 is also often used, but D2 is still more abundant, cost-effective, and has less ecological impact. ![]() Until relatively recently, all food fortification of vitamin D was with D2. Both D2 and D3 require irradiation (e.g., from sun exposure) to be formed from their sterol precursors: ergosterol, a phytosterol, is transformed into ergocalciferol (D2) cholesterol, an animal sterol, is transformed into cholecalciferol (D3). ![]() Dietary vitamin D2 comes primarily from plants, yeasts, and fungi dietary vitamin D3 comes mostly from animals, although a supplemental form can also be produced from lichen. People rarely get just one form of vitamin D. The term Vitamin D refers collectively to the vitamers D2 (ergocalciferol) and D3 (cholecalciferol) and their metabolites, which are all functional in the body.
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