Nature's Bounty Vitamin D3 5000 IU (125 mcg) is a high-potency supplement containing 150 rapid release softgels. This vitamin D3 formulation supports bone strength and immune system health through enhanced calcium absorption and immune function support. Each rapid release softgel contains 125 mcg (5000 IU) of vitamin D3 in an easily absorbable form. The bottle contains 150 softgels for an extended supply. Vitamin D3 (cholecalciferol) is essential for calcium absorption and utilization in the body, helping maintain strong bones and teeth. It also plays a vital role in supporting immune system function. The rapid release technology helps ensure optimal absorption of this fat-soluble vitamin.