Tromsø with some questions about how vitamin D works on the body both when we get enough and too little we passed the challenge on to one of our rd year students on a bachelor s degree in nutrition Marita Tveit. Marita has written a great summary here, with a high professional level, says Kolby. What are the main functions of vitamin D Vitamin D performs its main function on the skeleton, and plays an important role in calcium and phosphate homeostasis in the body. Unlike other vitamins taken in through the diet, vitamin D can also be formed in the skin through a chemical reaction with solar radiation.
Both vitamin D from dietary sources such as fatty fish, and vitamin D formed in the skin are considered a prohormone. To become an active hormone, it must undergo two reactions. First a reaction in the liver, which forms calcidiol, and then one in the kidneys, which forms calcitriol. The effects only occur when the active whatsapp mobile number list form, calcitriol, binds to its receptor in the cells. Blood tests usually measure the inactive form formed in the liver, calcidiol. The best known effect is the regulation of the calcium level in the blood. To restore normal calcium levels in the blood, vitamin D increases the absorption of calcium and phosphate from the intestine. At the same time, the reabsorption of calcium in the kidneys increases, and calcium is released from the skeleton.
Together, this results in an increased amount of calcium in the blood. At the same time, access to the minerals necessary for building the skeleton is ensured. The regulation of bone mineralization occurs in a complicated interaction between vitamin A and other hormones, such as parathyroid hormone and calcitonin. In addition to these functions, vitamin D receptors and activating enzymes have been discovered in several other tissues, such as muscle, brain, pancreas, as well as in the cardiovascular system and the immune systeThis may indicate that the vitamin plays an important role beyond bone health.