Vitamin D is “the sunshine vitamin.” It promotes healthy teeth and skin and plays a role in regulating blood pressure. It also helps maintain bones and optimal muscle and cellular function. Vitamin D helps the body absorb and use calcium.Jamieson uses only Vitamin D3, the nutrition industry's premium-grade natural-source Vitamin D. It’s the same form of Vitamin D that is naturally produced when skin is exposed to sunlight.Directions: Adults: Take one tablet daily with food.