TopicsSupplements and minerals
Vitamin D3 and K2
For vitamin D supplementation in winter
Most of the experts we follow recommend it.
Vitamin D3 with K2 is a reliable way to support healthy vitamin D levels when sunlight is low.
Who is behind it
Voices including a former research biochemist, a registered holistic nutritionist and a certified naturopath.
How strong the research is
Mostly expert experience so far, with published research still catching up.
In their words
“I take between 5,000 to 10,000 iuse a day and more closer to 10,000 in the winter because I'm in Pacific North Northwest baby and like I don't see the sun”
a registered holistic nutritionist
Vitamin D causes calcium retention and vitamin K2 directs calcium to proper places, preventing vascular calcification.
Vitamin D3 with K2 supports health during fertility and preconception, especially when sun exposure is limited.
Vitamin D3 increases calcium absorption and K2 helps distribute calcium properly for stronger bones.
With care
Some of the minds attach conditions. These are worth reading before you begin.
Supplementation with vitamin D3 and K2 can prevent seasonal drops in AMH levels when sunlight exposure is insufficient.
Talk it through
Entrain shows what the experts teach, so you can make better decisions with your own clinician. It does not diagnose or prescribe. If something is worrying you, start there.
How this reading was made
Every line here comes from a doctor, scientist or coach speaking publicly, and links to the moment they said it. Entrain listens for where independent experts arrive at the same place on their own, and shows where they part ways. Mostly expert experience so far, with published research still catching up.
None of the statements here come with a declared commercial interest. Last refreshed 23 September 2026.
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