Vitamin D

Vitamin D, also known as cholecalciferol (vitamin D3), ergocalciferol (Vitamin D2), or the sunshine vitamin, is one of the 24 micronutrients critical for human survival. In spite of the name, vitamin D is often referred to as a pro-hormone because the body is capable of producing its own vitamin D through mild sun exposure, while vitamins are nutrients that cannot be produced by the body and must be acquired by eating vitamin-rich foods or taking supplements.