The active ingredient colecalciferol is identical to the Colecalciferol that is found in the human body. It is found in the diet and is also produced in the skin after exposure to the sun. Colecalciferol (Vitamin D3) 20,000iu, Bovine Gelatine, Microcrystalline Cellulose, Mannitol, Butylated Hydroxyl Toluene, Polyvinylpyrrolidone, Isopropyl Alcohol.