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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 .
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. International units are used to quantify vitamins and biologics ( hormones , some medications , vaccines , blood products and similar biologically ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
For example, the US Adequate Intake recommendations from 1997 were 200 IU/day for infants, children, adults to age 50, and women during pregnancy or lactation, 400 IU/day for ages 51–70, and 600 IU/day for 71 and older. [168] Conversion: 1 μg (microgram) = 40 IU (international unit). [56]
International units (IU) are based on measured biological activity or effect, or for some substances, a specified equivalent mass. [citation needed] Enzyme activity is commonly used for e.g. liver function tests like AST, ALT, LD and γ-GT in Sweden. [5]
In the metric system, a microgram or microgramme is a unit of mass equal to one millionth (1 × 10 −6) of a gram.The unit symbol is μg according to the International System of Units (SI); the recommended symbol in the United States and United Kingdom when communicating medical information is mcg.
Alternative online IC50 calculator (www.ic50.org) based on Python, NumPy, SciPy and Matplotlib; ELISA IC50/EC50 Online Tool (link seems broken) IC50 to pIC50 calculator; Online tool for analysis of in vitro resistance to antimalarial drugs; IC50-to-Ki converter of an inhibitor and enzyme that obey classic Michaelis-Menten kinetics
Ish-Shalom et al. [69] performed a study in elderly women to compare the efficacy and safety of a daily dose of 1500 IU to a weekly dose of 10 500 IU and to a dose of 45 000 IU given every 28 days for two months. They concluded that supplementation with vitamin D can be equally achieved with daily, weekly, or monthly dosing frequencies.