Provides 1000iu of vitamin D per tablet. Vitamin D contributes to the normal function of the immune system and muscles. Microcrystalline Cellulose, Di-Calcium Phosphate, Vitamin D3 (with Arabic Gum, Antioxidant; d-a-Tocopherol (from soya), Tri-Calcium Phosphate), Magnesium Stearate, Anti-caking Agent: Silicon Dioxide.