Sorry to be so dim but ... is 100u (backwards y) the same as mg? I’m talking Vit D3+K2
D3 Supplements: Sorry to be so dim but ... is... - Thyroid UK
D3 Supplements
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Minimol
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SeasideSusieRemembering
µg is the same as mcg (micrograms) not mg (milligrams)
... and many people type ug instead of µg because typing u is a lot easier than typing µ with an English keyboard.
I Googled it, then copied and pasted 😂 I'd normally put ug.
Me too! Unless I'm feeling in a particularly pedantic mood. 
in reply to humanbean
I just cheated and copied the µ off your post! If anyone is interested it's the Greek letter M and is pronounced "Mew". Medical terms seem mostly in Greek or Latin, or named after some obscure doctor who discovered the disease, body part or process.
humanbean in reply to
I got my original µ by copying off SeasideSusie 's post, but don't tell her because I didn't ask permission.
in reply to humanbean
Of course not! 
in reply to humanbean
I didn't tell you anything did I SeasideSusie ?
OK got that thanks Susie. So what’s an iu?
10mcg = 400iu
So 100mcg = 4,000iu
Most D3 supplements show the dose in iu, is yours a H&B supplement, they show theirs in mcg I think.
If yours is a combined D3/K2, check the amount of K2 as 90-100mcg is enough for up to 10,000iu D3.
You don't work out your maintenance dose by weight, go by what the Vit D Council suggests to reach the recommended, then you work out by trial and error, and retesting twice a year, to get your maintenance dose. The poster below mentions 1000iu D3 per 25lb body weight. I weight 150lbs which would be 6000iu for me. That would take me way, way over the recommended level. We are all different, some of us make plenty of Vit D from the sun in the summer, some of us don't. I tend to need 2,000-2,500iu in the summer and 5,000iu x 5 days a week is generally enough in the winter for me to maintain my level. It's something we have to work out for ourselves, there is no set amount to work by.
This formula works.. it’s the protocol set by the vitamin d support group I’m in who have done much research.. k2 and magnesium are also cofactors which are needed to ensure the calcium your body absorbs once vitamin d level starts to raise is taken out of soft tissue and deposited into bones and teeth where needed.. I’m following this protocol and it’s working for me.
k2 and magnesium are also cofactors which are needed to ensure the calcium your body absorbs once vitamin d level starts to raise is taken out of soft tissue and deposited into bones and teeth where needed..
Yes, I know, I mention this every time I respond to people who ask about Vit D levels, and I give links to where my information comes from. See my reply to the OP's original post about her test results here healthunlocked.com/thyroidu......
But I don't agree that using 1,000iu D3 for every 25lb of body weight could possibly work for everyone, it may work for some but it certainly would be too much for me and many others. We have to ensure we don't take so much as to push us into toxicity level. If a person makes plenty of D3 naturally in the summer, there's no way they'd need to take the same amount they take in the winter when we can't make it from the sun. We're all individual, that has to be taken into account. Some people find that 2,000iu daily in the winter is enough to maintain the recommended level once they've reached it, that doesn't mean they only weigh 50lb.
Dolly- what is the vitamin d support group you're in?
Thank you.
Thanks Susie
The D3 I have is indeed combined with K2 - both are 100mcg and I’m taking 250 mg magnesium with this. Is that too much K2 ?
No, as I said 90-100mcg K2 is correct for up to 10,000iu D3.
If you are taking 100mcg D3 that is 4000iu.
helvellaAdministratorThyroid UK
I hope this document might help:
Vitamin d3 is usually measured in iu
It’s better to take separate supplements rather than combined because to take the amount of d3 required usually means you’ll be taking too much vitamin k2..
To raise levels from deficient I took 10,000iu of vitamin d3 and 100mcg vitamin k2 and around 500mg magnesium glycinate for around 4 months then lowered the vitamin d3 to a maintenance dose of 5000iu.. maintenance dose is worked out at 1000iu per 25lb of body weight
Hope this helps, not quite what you asked but all decent vitamin d3 is measured in iu
x
Thanks Dolly. Sounds like rather a lot of D3 but is iu smaller than microgram?
10 000 IU (international Units) is 250 µg (micro grams). One mg (milligram) is 1000 micro grams. 1 mg is 40 000 IU.
Be careful with International Units - they are different for every substance.
This site: thecalculatorsite.com/artic... seems to make it fairly clear!
On the vitamin d support group I’m in they say 10,000iu a day for three months then blood test to check levels and either continue until optimal level is achieved and once there go on to maintenance dose of 1000iu per 25lb of body weight
Thanks Dolly!
Phillip Day has a lot of info about vit D and the amount to take. I suggest one of his health talks to anyone. He does a tour of the UK once a year, and is about to begin the 2019 one. Info at Credence.org. He addresses many topics and tells people about the latest science truth and debunks false science.
I take 4000 iu a day of vitamin d3 with two tablets of vitamin k2. The government recommended levels are far too low and designed to keep us ill. It is not the same as mg. Hope this helps.
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