What is it?
A fat-soluble vitamin that the human body makes in the skin in response to UV light, but is also available from food (but in limited concentrations).
What does it do?
Complements both calcium and phosphorous levels which in turn helps maintain bone density. But it also has important roles within the immune system as it helps stimulate the body’s basic immune responses as well as offering a degree of protection against some forms of cancer, especially breast cancer.
How do I know if I need it?
Unlike most other supplements, you probably do as on average we only get 45% of the amount of vitamin D that we should be getting.
How should I take it
No more than 1100iu daily (in this case more is not better) and look for vitamin D in the form of D3 (check the labels).