VITAMIN D3 2000/Vitamin D3 5000 is cholecalciferol provided in convenient softgels. Vitamin D3 Liquid is cholecalciferol derived from lanolin and provided in a liquid base of sunflower oil and purified water. In this liquid formula, vitamin D and sunflower oil are combined using a special micro-emulsification process designed to create a natural micellized matrix which, when coated by the stomach bile, will encourage absorption.*