This essential nutrient occurs in two major forms. Vitamin D2 (ergocalciferol) comes from fungal and plant sources while premium Vitamin D3 (cholecalciferol), which is more natural and beneficial, is produced when skin is exposed to sunlight. Very few foods naturally contain Vitamin D, while heavy clothing, cloudy weather and sun avoidance can all inhibit the production of Vitamin D in the body. As a result, most people experience insufficient levels of Vitamin D for optimal health. Vitamin D Soft Chews 1,000 IU — Natural Chocolate Flavour contain the recommended daily intake of premium Vitamin D3 derived from the finest lanolin on the sun-drenched slopes of New Zealand.