Vitamin D3

Vitamin D3, also known as cholecalciferol, is a fat-soluble vitamin essential for human health. It is naturally produced in the skin when exposed to ultraviolet B (UVB) rays from sunlight. Commercially, it is often derived from lanolin (a waxy substance from sheep's wool) or from plant sources like lichen.

Manufacturers add Vitamin D3 to foods as a nutrient to fortify them and help prevent deficiencies. It is crucial for calcium absorption and bone health. It is commonly found in fortified milk, cereals, yogurt, and plant-based milk alternatives.

In the US, Vitamin D3 is recognized as an essential nutrient. The US National Academies establish Dietary Reference Intakes (DRIs) and Tolerable Upper Intake Levels (ULs) for vitamins and minerals, including Vitamin D. It is vital for maintaining healthy bones and teeth, and supporting immune function. JECFA has evaluated Vitamin D and set an acceptable daily intake; EFSA has also evaluated its safety and efficacy. Evidence consistently supports its role in preventing conditions like rickets and osteomalacia.