Cholecalciferol, also known as vitamin D3, is a fat-soluble vitamin that is naturally produced by the skin when exposed to sunlight. It is also found in certain foods, such as fatty fish, egg yolks, and fortified dairy products.
Cholecalciferol is important for bone health, as it helps the body to absorb calcium and maintain healthy levels of calcium and phosphorus in the blood. It is also involved in immune function and may have other health benefits, such as reducing the risk of certain cancers and improving muscle strength and balance in older adults.
Cholecalciferol is commonly added to protein powders and other supplements as a source of vitamin D. It is also often used to fortify foods, such as milk and breakfast cereals.
Cholecalciferol is generally considered safe when used in recommended amounts.