Origin: The synthesis of cholecalciferol in the skin from cholesterol through a chemical reaction that is dependent on sun exposure. The flesh of fatty fish also contain a significant amount of vitamin D.
Overview: Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and multiple other biological effects. It plays a significant role in calcium homeostasis and metabolism.
Common Dosage: 600 IU per day