Talk:International unit

message: I am confused, so if I had capsul of 20 I.U and I took two would that equal 40 I.U? If I have a topical vitamin E of 12,000 I.U is it 12,000 I.U total, bottle size or is it 12,000 I.U per application? Do two 12,000 I.U bottles equal 24,000 I.U or is it still 12,000 I.U?
:If you take two 20 I.U. capsules then you get a total of 40 I.U., yes. Twice the amount means twice the I.U.'s. Whether the 12,000 I.U. number is per bottle or per application depends on what exactly is written on the bottle. AxelBoldt (talk) 18:40, 16 March 2008 (UTC)
thread_title: Confused

message: In the introduction, it says, "In order to remove the possibility of having the letter: "I" confused with the digit: "1", some hospitals have it as a stated policy to omit the "I", that is: 'to only use U or E when talking and writing about dosages'..."
Whereas, in section "Difference from unit of enzyme activity" it clearly states that one should not drop the I since "The IU should not be confused with the enzyme unit, also known as the International unit of enzyme activity and abbreviated as U."
How can these both be true?!  — Preceding unsigned comment added by Shinyparticle (talk • contribs) 15:49, 20 June 2011 (UTC)
thread_title:  Seeming contradiction 

message: The atricle writes: ‹1 IU is equivalent to 0.0347 mg of human insulin (28.8 IU/mg).› It is confused. mg is a unit of mass. IU/mg is a unit of the mass fraction (a concentration-like unit). Which is correct? ZJ (talk) 12:25, 31 October 2012 (UTC)
thread_title:  unit of IU of Insulin 

message: The insulin unit conversion is not consistent with his molar weight 5808 Da (g/mol):
Using the insulin unit definition as 0.0347 mg/IU and human insulin molar mass 5808 g/mol:  1 IU = (0.0347*10^-3 g) / (5808 g/mol) = 5.974 * 10^-9 mol.
But in other sources is written, that 1 IU of insulin is 6.945 * 10^-9 mol.
Where is the mistake?
I'm running into the same problem. Did you ever solve this?
El Snubbe 15:51, 7 May 2018 (UTC)
thread_title:  1 µIU of Insulin = 6.945 pmol or 5.974 pmol? 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: according to e.g.
https://lpi.oregonstate.edu/mic/vitamins/vitamin-C#RDA
and
https://ods.od.nih.gov/factsheets/VitaminC-HealthProfessional/#h2
and
https://dietarysupplementdatabase.usda.nih.gov/ingredient_calculator/calc_adult2_new.php
and
https://dietarysupplementdatabase.usda.nih.gov/Conversions.php
and
http://goldenlifehealth.com/vitamins-conversion-chart/
IU is only used/defined for some vitamins but not for vitamin C, though 
https://www.thecalculatorsite.com/articles/units/convert-ui-to-mcg.php
says what's in the text now, perhaps from the cited book 'Ultimate Pharmacy Calculations Guide' (page not available in free preview to dbl-check). Also here https://www.etoolsage.com/converter/IU_Converter.asp and here https://mypharmatools.com/othertools/iu the calculators yield 50ug = 1IU but there's no refs.
Seems the text in the article should better be changed to read the Adequate Intake (AI) or Recommended Dietary Allowance (RDA) from any refs above then, or add the these refs for the IU conversion.  — Preceding unsigned comment added by 93.32.68.209 (talk) 20:32, 26 October 2020 (UTC)
replies: text: I found a 1935 ref where it is defined. Guess that's solved. That said, I still don't see a point in mentioning it. Artoria2e5 🌉 14:25, 29 December 2023 (UTC)
thread_title:  IU seems not defined for vitamin-C