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Vitamin D toxicity, or hypervitaminosis D, is the toxic state of an excess of vitamin D. The normal range for blood concentration of 25-hydroxyvitamin D in adults is 20 to 50 nanograms per milliliter (ng/mL).
While some studies have found that vitamin D 3 raises 25(OH)D blood levels faster and remains active in the body longer, [44] [45] others contend that vitamin D 2 sources are equally bioavailable and effective for raising and sustaining 25(OH)D. [46] [47] If digestive disorders compromise absorption, then intramuscular injection of up to ...
Tolerable upper intake levels (UL), to caution against excessive intake of nutrients (like vitamin A and selenium) that can be harmful in large amounts. This is the highest level of sustained daily nutrient consumption that is considered to be safe for, and cause no side effects in, 97.5% of healthy individuals in each life stage and sex group.
The latest results compare bone fractures in those who took either a high dose — 2,000 international units of the most active form of vitamin D, called D-3 — or dummy pills every day for five ...
Cholecalciferol is a form of vitamin D which is naturally synthesized in skin and functions as a pro-hormone, being converted to calcitriol. This is important for maintaining calcium levels and promoting bone health and development. [4] As a medication, cholecalciferol may be taken as a dietary supplement to prevent or to treat vitamin D ...
Cladina arbuscula specimens grown under different natural conditions contain provitamin D 2 and vitamin D 2, ranges 89–146 and 0.22–0.55 μg/g dry matter respectively. They also contain vitamin D 3 (range 0.67 to 2.04 μg/g) although provitamin D 3 could not be detected. Vitamin D levels correlate positively with UV irradiation. [26] Plantae
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