Vitamin D is required to promote calcium absorption, which helps to maintain healthy bones and teeth Vitamin D also supports a healthy immune system and neuromuscular function The Vitamin D3 in this product is the same form produced by the body when our skin is exposed to sunlight. As we age, our bodies may absorb this important nutrient less efficiently. This formulation offers advanced Vitamin D3 support in oil-based softgels to promote optimal absorption and assimilation.