Contains Vitamin D, which helps to maintain bone mineral density Assists Calcium absorption Supports immune system health and general wellbeing Features Vitamin D helps calcium absorption and a diet deficient in calcium can lead to osteoporosis in later life. Vitamin D is mainly produced in our skin by a reaction that requires sunlight. People who limit their exposure to sunlight may have an increased need for Vitamin D supplementation. This formula provides a one-a-day dose of Vitamin D3 in a convenient, easy-to-swallow capsule.