Wuhan HHD Factory Supply Vtamin D
Vitamin D (abbreviated as VD) is a fat soluble vitamin, which is a cyclopentane dihydrophenanthrene compound. It is a group of vitamins related to sterols in structure and can prevent rickets in function. The most important vitamins are D3 and D2. The former is made of 7-dehydrocholesterol under human skin by ultraviolet irradiation. The latter is made of ergosterol contained in plants or yeast by ultraviolet irradiation. The main function of vitamin D is to promote the absorption of calcium and phosphorus by small intestinal mucosal cells. Intestinal calcium absorption requires a calcium binding protein. 1,25-dihydroxyvitamin D3 can induce the synthesis of this protein, promote the absorption of Ca2 +, promote the renewal of calcium salt and new bone formation, promote phosphorus absorption and the reabsorption of calcium and phosphorus by renal tubular cells. Therefore, it can increase the concentration of blood calcium and phosphorus, which is conducive to new bone formation and calcification.
In addition, vitamin D can promote the growth and differentiation of skin cells and regulate immune function. General adults often contact with sunlight to avoid deficiency diseases. Infants, pregnant women, nursing mothers and the elderly who do not often go outdoors should increase the supply of vitamin D to 10% a day μ G (equivalent to 400 international units). Children who lack vitamin D can suffer from rickets and adults from osteomalacia
