維生素d 相關
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Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, along with numerous other biological functions. [1][2] In humans, the most significant compounds within this group are vitamin D 3 (cholecalciferol) and vitamin D 2 (ergocalciferol). [2][3]
Vitamin D deficiency or hypovitaminosis D is a vitamin D level that is below normal. It most commonly occurs in people when they have inadequate exposure to sunlight, particularly sunlight with adequate ultraviolet B rays (UVB).
The vitamin D receptor (VDR also known as the calcitriol receptor) is a member of the nuclear receptor family of transcription factors. [5] Calcitriol (the active form of vitamin D, 1,25-(OH) 2 vitamin D 3) binds to VDR, which then forms a heterodimer with the .
Calcitriol is, strictly, the 1-hydroxylation product of calcifediol (25-OH vitamin D 3), derived from cholecalciferol (vitamin D 3), rather than the product of hydroxylations of ergocalciferol (vitamin D 2).
Ergocalciferol, also known as vitamin D2 and nonspecifically calciferol, is a type of vitamin D found in food and used as a dietary supplement. [3] . As a supplement it is used to prevent and treat vitamin D deficiency. [4] . This includes vitamin D deficiency due to poor absorption by the intestines or liver disease. [5] .
Calcifediol, also known as calcidiol, 25-hydroxycholecalciferol, or 25-hydroxyvitamin D 3 (abbreviated 25(OH)D 3), [1] is a form of vitamin D produced in the liver by hydroxylation of vitamin D 3 (cholecalciferol) by the enzyme vitamin D 25-hydroxylase.
Vitamin B12, also known as cobalamin, is a water-soluble vitamin involved in metabolism. [ 2 ] It is one of eight B vitamins. It is required by animals, which use it as a cofactor in DNA synthesis, and in both fatty acid and amino acid metabolism. [ 3 ]
維生素d 相關
廣告In today’s toxic environment, supplements are not simply a good idea, they are necessary. Dr. Al Sears, MD. is one of the first physicians board-certified in anti-aging medicine.