Most people are deficient in Vitamin D. Vitamin D can be found as vitamin D2 (“ergocalciferol” or pre-vitamin D) (produced in plants and fungi) and vitamin D3 (“cholecalciferol”) (animals, including humans). Both D3 and D2, the precursors are hydroxylated in the liver and kidneys to form 25- hydroxyvitamin D (25(OH)D), which is the non-active ‘storage’