Natural Factors Vitamin D3 is carefully blended with organic flaxseed oil delivered in an easy-to-swallow softgel. Vitamin D is called ''the sunshine vitamin'' because we can usually get it from the sun's ultraviolet rays. People who live far away from the equator may not make enough vitamin D in their skin during long gloomy winters. This vitamin is essential for bone development and is needed for calcium and vitamin C absorption and supports the nervous system. It plays a dual role as both a vitamin and a hormone. Vitamin D3 which is the same form found in fish oils and eggs is the form produced by sunlight on human skin. Natural Factors Vitamin D3 (cholecalciferol) is derived from sheep wool lanolin.Other products from HerbsPro