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Vitamin D3 + K2

Fixes low vitamin D. Big trials found little else.

B

Grade B: Some human proof

Small, early or mixed results in people.

The grade is for the use people talk about, not for every use. Filed under: Health and wellness, over the counter.

How it works

Vitamin D helps absorb calcium. K2 helps direct calcium to bone.

How it was given in studies

By mouth. In the trials people swallowed it as a capsule, tablet, powder or drink.

This is what the studies did. It is not a how-to.

What studies saw

Corrects low vitamin D reliably. A large US trial found daily vitamin D did not lower cancer or heart events.

The trade-off

High doses over time can raise blood calcium. The NIH fact sheet gives the adult upper limit.

When it showed up, in studies

1 to 3 months

Blood vitamin D rises over 2 to 3 months.

Sources

  1. Trial in 25,871 adults
  2. NIH vitamin D fact sheet
  3. Review of eight trials
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Keep going

See how Vitamin D3 + K2 mixes with others in the stack builder → Over-the-counter supplements: the claims, checked →

We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.