*Each capsule contains 1000 IU of natural vitamin D (cholecalciferol) for normal calcium absorption and deposition in bone. *It is also needed for normal immune function and normal insulin activity. *Although vitamin D is a hormone produced by the action of sunlight on skin, elderly people produce it less efficiently, and those who do not get sun exposure (homebound people, those in northern latitudes, and those who use sun block extensively) benefit from supplements. *Slows joint damage due to arthritis. *Relieves symptoms of psoriasis. *Essential for building strong bones and teeth.