1. What is the importance of vitamin D in the body?
Vitamin D is a fat-soluble nutrient that requires conversion in the liver and kidneys to form the physiologically active form of vitamin D known as calcitriol. Active vitamin D functions as a steroid hormone in the body, augmenting calcium and phosphorus absorption in the kidneys, which helps to form and maintain healthy bones and teeth. The principal physiological function of vitamin D is to maintain normal blood levels of both calcium and phosphorus, as well as to promote bone mineralization.