What is vitamin D?
Did you know that “Vitamin D” is not really a vitamin? It’s actually a steroid hormone produced in the body after direct exposure of the skin to ultraviolet B (UVB) radiation in sunlight. Both the vitamin D that your body produces and the vitamin D from supplements must be changed by your body several times before it can function properly. Vitamin D manages the amount of calcium in your blood and other body tissues, helps cells all over your body communicate properly, and assists your immune system in functioning effectively (Vitamin D Council, 2013).