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Multivitamins nutrition facts label showing that the international unit of, for example, vitamins D and E correspond to different gram values. In pharmacology, the international unit (IU) is a unit of measurement for the effect or biological activity of a substance, for the purpose of easier comparison across similar forms of substances.
A third important effect of PTH on the kidneys is stimulation of the conversion of 25-hydroxy vitamin D into 1,25-dihydroxy vitamin D (calcitriol). [221] This form of vitamin D is the active hormone which promotes calcium uptake from the intestine via the action of calbindin. [223] Calcitriol also reduces calcium loss to urine. [220]
One gram is 40 000 000 (40 × 10 6) IU, equivalently 1 IU is 0.025 μg, or 25 ng. Dietary reference intake values for vitamin D ( ergocalciferol , which is D 2 , or cholecalciferol, which is D 3 ), or both, have been established and recommendations vary depending on the country:
raw: Vitamin D (D 2 + D 3): 0.4 μg (18 IU) dried: Vitamin D (D 2 + D 3): 3.9 μg (154 IU) Lichen. 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 ...
The enzyme unit, or international unit for enzyme (symbol U, sometimes also IU) is a unit of enzyme's catalytic activity. [ 1 ] 1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micro mole of substrate per minute under the specified conditions of the assay method .
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).