1,25-Dihydroxy Vitamin D3 ,D3

1,25-Dihydroxy Vitamin D3, also known as D3, is a hormone that is essential for the proper functioning of the body. It is synthesized in the skin when exposed to sunlight and can also be obtained from dietary sources such as fortified foods and supplements. Once in the body, D3 is converted into its active form, 1,25-dihydroxyvitamin D3, which plays a crucial role in maintaining healthy bones, regulating calcium and phosphorus levels, and supporting immune function. D3 works by binding to vitamin D receptors located in various tissues throughout the body, including the intestine, kidney, and bone. Once bound, it stimulates the absorption of calcium from the intestine, reabsorption of calcium from the kidney, and mobilization of calcium from the bone. In addition, D3 is involved in regulating immune function, including the differentiation and activation of immune cells. Chemically, D3 is a steroid hormone that belongs to the family of secosteroids. It is structurally similar to cholesterol and is synthesized from a precursor molecule found in the skin. The active form of D3 is produced in the kidney through a series of enzymatic reactions that convert it into 1,25-dihydroxyvitamin D3. D3 is fat-soluble and can be stored in adipose tissue and released as needed. In summary, D3 is a vital hormone that is necessary for maintaining healthy bones, regulating calcium and phosphorus levels, and supporting immune function. It is synthesized in the skin and can also be obtained from dietary sources. D3 works by binding to vitamin D receptors in various tissues and stimulating the absorption and mobilization of calcium. Chemically, D3 is a steroid hormone that belongs to the family of secosteroids and is fat-soluble.