Thyroid UK
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Vitamin D3 and K2

Having been diagnosed last year with Vit D deficiency I have been taking 3000 iu of Vitamin D3 with 100 mcg of vitamin K2 this winter and my recent blood test was 121 nmol/L. Can I now lower my vitamin D3 dosage to 1000 iu and cease the vit K2 as I should get some vitamin D from the sunshine till September. I assume I should go back to the higher level from October.

Anyone know at what level of vitamin D3 you need to add vit K2. I don't want to take it unnecessarily as it's qute expensive.

I also have underactive thyroid and 3 monthly B12 injections.

1 Reply

carer999 You need K2 if you take D3 regardless of the dose of D3. D3 aids absorption of calcium from food and K2-MK7 directs it to bones and teeth where it is needed and away from arteries and soft tissues where it can cause problems such as kidney stones, calcification of the arteries, etc

You can get D3/K2 combination supplements. I get one with D3/K2-MK7/Vit A as I have COPD and bronchiectasis as well as hypothyroidism and Vit A is supposed to help lung disease and Vit D is supposed to help reduce flare ups of COPD. I like to keep my Vit D level at the very top of the recommended range of 100-150nmol/L now that I have optimised my severe deficiency. We should test once or twice a year to keep an eye on our level.

We're all different in how much we need as a maintenance dose and I'm using 2000iu D3 5 times a week at the moment, I may reduce slightly during the summer but I am not one to go out in the sun, I don't​ tolerate it well.

My combo supplement costs me £19.95 for 60 capsules, I think that's reasonable as I am buying one supplement instead of three. There are other D3/K2 combos that are cheaper.

You can get a very good K2-MK7 softgels for £11.45 for 60 softgels


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