Vitamin D supplements are available in two forms: D2 and D3. While both can help address a vitamin D deficiency, D3 is typically recommended because it’s slightly more effective than D2 ...

Vitamin D3 (cholecalciferol). Found in some animal foods, like fatty fish and egg yolks. Vitamin D2 (ergocalciferol). Found in some plants, mushrooms, and yeasts.

Study questions the role of vitamin D2 in human health but its sibling, vitamin D3, could be important for fighting infections. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com ...