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Mercola has a good article (link below) but he wants your email before you can read it. So:

Story at-a-glance

If you take supplemental vitamin D3, you also need to be mindful of taking extra vitamin K2 and magnesium

It’s important to increase your vitamin K2 intake when taking high-dose supplemental vitamin D to avoid complications associated with excessive arterial calcification

You need 146% more vitamin D to achieve a blood level of 40 ng/ml (100 nmol/L) if you do not take supplemental magnesium, compared to taking your vitamin D with at least 400 mg of magnesium per day

Vitamin D improves magnesium absorption, but taking large doses of vitamin D can deplete magnesium, as magnesium is required in the conversion of vitamin D into its active form

Combined intake of both supplemental magnesium and vitamin K2 has a greater effect on vitamin D levels than either individually. You need 244% more oral vitamin D if you’re not concomitantly taking magnesium and vitamin K2

https://articles.mercola.com/sites/articles/archive/2022/01/11/vitamin-d3-k2-and-magnesium.aspx

Mercola has a good article (link below) but he wants your email before you can read it. So: Story at-a-glance If you take supplemental vitamin D3, you also need to be mindful of taking extra vitamin K2 and magnesium It’s important to increase your vitamin K2 intake when taking high-dose supplemental vitamin D to avoid complications associated with excessive arterial calcification You need 146% more vitamin D to achieve a blood level of 40 ng/ml (100 nmol/L) if you do not take supplemental magnesium, compared to taking your vitamin D with at least 400 mg of magnesium per day Vitamin D improves magnesium absorption, but taking large doses of vitamin D can deplete magnesium, as magnesium is required in the conversion of vitamin D into its active form Combined intake of both supplemental magnesium and vitamin K2 has a greater effect on vitamin D levels than either individually. You need 244% more oral vitamin D if you’re not concomitantly taking magnesium and vitamin K2 https://articles.mercola.com/sites/articles/archive/2022/01/11/vitamin-d3-k2-and-magnesium.aspx

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[–] [deleted] • 1 pt

That's the best way to get Vit D, but it isn't enough for me. I have fair skin and live in a northern area. Even in the summer when I spend a lot of time outdoors in the sun, my D levels are way too low. This is the situation for a lot of people, especially the nuts who won't go outside without sunscreen. You won't know for sure unless you get a blood test. I get my D levels checked every year as part of my routine physical exam, and I definitely need to supplement.

[–] • 0 pt (edited )

In Australia, lack of vitamin D is a big problem due to our "slip slop slap" campaign in the 80's.

Edit: readability.