Swisse Ultiboost Vitamin D contains 1000 IU of vitamin D3 to increase the absorption of calcium and help maintain healthy bone density. Vitamin D3 is retained in the bloodstream more effectively when compared to vitamin D2 (synthetic). 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 and supporting structures to attach. Bones also function as a site for mineral storage and blood cell formation. Very few foods naturally contain adequate levels of vitamin D so regular exposure to sunlight is required for the body to produce vitamin D3. Modern lifestyles often reduce the time exposed to sunlight, which increases the need to obtain vitamin D3 from other sources. Swisse Ultiboost Vitamin D may help in the management of vitamin D deficiency and helps improve muscle strength in the elderly. The Swisse Ultiboost range is based on over 25 years of research.