Vitamin D is a fat-soluble vitamin that also acts as a pleiotropic hormone. There are two major forms of nutritional vitamin D, vitamin D2and D3. Vitamin D undergoes sequential hydroxylations, and reaches its final active form, 1,25-dihydroxyvitamin D [1,25(OH)2D]. 1,25(OH)2D interacts with its nuclear receptor to modulate gene expression and biological actions. The vitamin D receptor (VDR) is present in a wide variety of cells including enterocytes, osteoblasts, and renal tubular cells. Vitamin D is crucial for proper functions of a wide variety of organ systems, and its deficiency is highly prevalent in the general population and also among kidney stone formers.
1. Vitamin D3 has the physiological function to promote intestinal calcium absorption, regulate calcium.
2. Promoting phosphorus metabolism inducing bone calcium and phosphorus calm,
3. Helping promote bone growth and prevent rickets.
Widely used in medicine, nutrition fortifier in nutraceutical and food product.