Vitamin D 'triggers and arms' the immune system - Telegraph

Vitamin D 'triggers and arms' the immune system - Telegraph: "Vitamin D is crucial to the fending off of infections, claims new research.

The so-called sunshine vitamin, which can be obtained from food or manufactured by human skin exposed to the sun, plays a key role in boosting the immune system, researchers believe.
In particular it triggers and arms the body's T cells, the cells in the body that seek out and destroy any invading bacteria and viruses."