Kyolic Vitamin D3 is a synergistic combination of Aged Garlic Extract made from organic raw garlic along with the most bioavailable form of naturally sourced Vitamin D-D3 (Cholecalciferol). Kyolic and Vitamin D3 have been individually shown in several scientific studies to support many important areas of immune health. Vitamin D3 or Cholecalciferol is a fat-soluble vitamin that can be synthesized in the skin with exposure to sunlight (ultraviolet B) or taken through foods or supplements with calcium can improve bone mineral density.Other products from HerbsPro