Vitamin D is a fat soluble essential vitamin with hormonal properties. It is made from cholesterol by our kidneys when the skin absorbs the UVB rays in sunlight.
Vitamin D helps to control the amount of calcium and phosphate in the body, which is important for proper development and function of teeth and bones. It also plays an important role in hormonal signalling, as well as potentially increasing testosterone in men. Sub-optimal or deficient levels of vitamin D can lead to fatigue, bone pain, easily damaged skin, depression, impaired wound healing, hair loss and osteoporosis.