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Vitamin D is a vitamin that plays a major role in the maintenance of serum calcium and phosphate concentrations in the body, and is important in bone health. Vitamin D has also been associated with fracture prevention, improved muscoloskeletal function and reduced rates of falls, cancer prevention,and protection against some autoimmune diseases. A major source of vitamin D for most people is exposure of the skin to sunlight. Synthesis of vitamin D in the skin depends on several factors. The amount of UVB radiation available in sunlight is related to wavelength, amount of ozone in the atmosphere, and angle of the sunlight, which in turn depends on latitude, season, and time of day. For every 10 degrees change in latitude