Cholecalciferol, commonly known as Vitamin D3, is a fat-soluble vitamin that plays a crucial role in various physiological processes. Cholecalciferol is a vital nutrient with implications for bone health, immune function, and overall well-being. Our source of Vitamin D3 is VegD3® from algae and is certified organic, vegan, Kosher and Halal, 100% non-GMO plant source.