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What does µg mean?

Tuesday July 29, 2014 at 12:49pm
µg means microgram or mcg

µg is the correct symbol for the metric measurement microgram which is one millionth of a gram or one thousandth of a milligram.

The symbol for µ is a Greek letter (mu) which means 'small'.

Due to the symbol µ being typographically unavailable much of the time i.e. you cannot type it on a keyboard, other versions were devised; two of which are ug and mcg and are now widely used in its place.

» Categories: Terminologies Explained


Saturday April 23, 2016 at 7:37pm by Debra Usouski
what is the difference between mcg & ug? If something is 60mcg & you are allowed 300ugs, what does that mean?
Replied to on: Tuesday April 26, 2016 at 12:15pm
Hi Debra,
There is no difference - they both mean 'micrograms'
µ is the Greek letter micron, which is used as µg for micrograms; sometimes this is abbreviated as mcg instead.
So 60mcg is one-fifth of 300µg, so you are well within the defined limit.
(or 60µg is one-fifth of 300mcg - they mean the same thing)
I hope this clears things up!
Saturday September 17, 2016 at 3:38am by Jarragum
I can find plenty of explanations for ug in vitamin amounts but what is Aug?
Replied to on: Saturday September 24, 2016 at 1:55pm
Can you clarify what you mean by Aug please? Maybe an example of where you have seen this? Thanks.
Tuesday October 11, 2016 at 3:34am by Jarragum
Thank you for your reply, saying the 'A' doesn't mean anything but I've thought about this & there must be a reason they put it there. It appears in several other lists of 'Nutrition and You' site. The lists are from USDA (United States Department of Agriculture. The 'A' only appears on some ug's not all. Does it mean it only applies to America or some place starting with 'A'? I hope someone can shed some light on this. Thanks.
Replied to on: Tuesday October 11, 2016 at 8:43am
Having investigated this in detail with you via direct messages, it transpires that it is just a formatting issue caused by some sort of conflict/ error between the way the document was created and how it is being displayed now. Sometimes, special characters (such as the mcg µ) or non-printing characters (such as a space) in a document can cause issues between different creation and display modes. So in conclusion, just ignore the  and read it as µg.

Mystery solved!
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