Vitamin D2, or Ergocalciferol, is a fat-soluble vitamin derived from the UV irradiation of ergosterol found in yeast and fungi. This makes it a suitable vitamin D source for vegetarian and vegan applications. It is commercially produced by exposing yeast-derived ergosterol to ultraviolet light and is available as crystalline powder or oil-based solutions.
Vitamin D2 supports calcium and phosphorus absorption, bone health, and immune function, similar to Vitamin D3 though with somewhat lower potency. It is used in food fortification, dietary supplements, and pharmaceutical preparations, particularly in markets where plant-based vitamin D sources are preferred. Vitamin D2 is approved for food fortification in dairy alternatives, cereals, and beverages worldwide.
