D3 offers 100% percent natural and vitamin D3 in pure MCT powder. MCT is a good fat that may increase the absorption of vitamin D3 for optimal results. It is devoid of lanolin. Extracted from a plant source called a lichen the only completely natural of D3 available today. Vitamin D3 is more potent than vitamin d2 (ergocalciferol). Vitamin D3 is essential towards building and maintaining healthy bones plays an important role in brain health heart protection muscle strength and autoimmune disorders.