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Vitamin D 5. sitocalciferol. (made from 7-dehydrositosterol) Several forms (vitamers) of vitamin D exist, with the two major forms being vitamin D 2 or ergocalciferol, and vitamin D 3 or cholecalciferol. [ 1 ] The term 'vitamin D' refers to either D 2 or D 3, or both, and is known collectively as calciferol.
The two most common forms are vitamin D2 and vitamin D3. Vitamin D is a fat-soluble vitamin which plays a major role in bone health, immunity, and nerve communication between the brain and muscle ...
Cholecalciferol, also known as vitamin D 3 or colecalciferol, is a type of vitamin D that is produced by the skin when exposed to UVB light; it is found in certain foods and can be taken as a dietary supplement. [3] Cholecalciferol is synthesised in the skin following sunlight exposure. [4]
Both vitamin D2 and D3 are good, but “D3 has better bioavailablilty,” says Dr. Manson, meaning that it’s more easily used by your body. But that doesn’t mean any old brand will do.
Vitamin D deficiency is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D in the blood, which is the most accurate measure of stores of vitamin D in the body. [1][7][2] One nanogram per millilitre (1 ng/mL) is equivalent to 2.5 nanomoles per litre (2.5 nmol/L). Severe deficiency: <12 ng/mL = <30 nmol/L[2] Deficiency ...
But “vitamin D3 is more bioavailable (a.k.a has a stronger ability to be absorbed and used in the body), which is why people tend to prefer vitamin D3," says JoAnn Manson, M.D., MPH, DrPH, a ...
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