Vitamin D3, the form of Vitamin D formed in the skin, is a potent and active form of the vitamin. Our bodies produce Vitamin D when the skin is exposed to sunlight, however, as we age, the skin produces Vitamin D less efficiently. Vitamin D absorption may also decrease with age, making vitamin D supplementation especially beneficial for older individuals. This formula delivers 250 mcg of Vitamin D to help support the immune system and help maintain bone health.(1)