Swisse Ultiboost Calcium + Vitamin D contains a premium form of calcium (citrate) and naturally derived vitamin D3 for increased calcium absorption. The human skeleton consists of 206 bones that provide a framework for the body to help maintain shape, protect vital organs and provide a place for muscles to attach. Bones also function as a site for mineral storage and blood cell formation. Calcium requirements increase with age, gender, post menopause, a diet low in calcium, pregnancy and lactation. Swisse Ultiboost Calcium + Vitamin D helps to address dietary calcium deficiency. Vitamin D is included to help the absorption of calcium, as a diet deficient in calcium may contribute to osteoporosis in later life.