Swisse Ultiboost Vitamin D is a premium quality formula containing 1000 IU of naturally derived vitamin D3 to support bone and teeth health. Bone & Teeth Health: Supports the development and maintenance of healthy bones and teeth. Increased Absorption: Vitamin D3 assists the absorption and utilisation of calcium, which helps maintain healthy bone density. Vitamin D3 is retained in the bloodstream more effectively when compared to vitamin D2 (synthetic). Muscle Health: Vitamin D helps support muscle function. Immune Health: Supports a healthy immune system. 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. 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 has been formulated based on scientific evidence to provide a naturally derived source of vitamin D3 in a convenient, one-a-day dose.