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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]
People diagnosed with schizophrenia tend to have lower serum vitamin D concentrations compared to those without the condition. This may be a consequence of the disease rather than a cause, due, for example, to low dietary vitamin D and less time spent exposed to sunlight. [152] [153] Results from supplementation trials have been inconclusive. [152]
One minimal erythemal dose of sunlight UV radiation provides the equivalent of about 20,000 IU of vitamin D2, taken as an oral supplement. [citation needed] If an adult's arms and legs are exposed to a half minimal erythemal UV radiation, it is the same as taking 3,000 IU of vitamin D 3 through an oral supplement. This exposure of 10–15 ...
7-Dehydrocholesterol (7-DHC) is a zoosterol that functions in the serum as a cholesterol precursor, and is photochemically converted to vitamin D 3 in the skin, therefore functioning as provitamin-D 3. The presence of this compound in human skin enables humans to manufacture vitamin D 3 (cholecalciferol).
For the most part, vitamins are obtained from the diet, but some are acquired by other means: for example, microorganisms in the gut flora produce vitamin K and biotin; and one form of vitamin D is synthesized in skin cells when they are exposed to a certain wavelength of ultraviolet light present in sunlight. Humans can produce some vitamins ...
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]
Human bodies produce it naturally when exposed to sunlight, and it supports our bones, immune system, heart, and even brain. Making sure to get enough vitamin D and that levels are in the right ...
Endogenous production with full body exposure to sunlight is comparable to taking an oral dose between 250 μg and 625 μg (10,000 IU and 25,000 IU) per day. [ 9 ] [ 10 ] Vitamin D oral supplementation and skin synthesis have a different effect on the transport form of vitamin D, plasma calcifediol concentrations.