Can you take Vitamin D3 and Vitamin K2 together?
Yes. D3 increases calcium absorption and K2 directs that calcium into bone instead of arteries. One of the best-supported pairings in supplement science.
Severity
Info
Evidence
strong
Timing
Together with a fatty meal.
How it works
D3 upregulates intestinal calcium uptake while K2 activates osteocalcin and matrix GLA protein, which shuttle calcium into bone matrix and away from soft tissue.
At typical doses (1,000–5,000 IU D3 with 100–200 mcg K2 as MK-7), the synergy is well-documented. K2 deficiency may partly explain why high-dose D3 alone has shown mixed cardiovascular results in some trials.
What to do
Take both with a meal containing fat. Many supplements combine them in a single capsule. MK-7 is the preferred K2 form for its longer half-life.
Frequently asked
Should I separate Vitamin D3 and Vitamin K2?
This is an informational interaction. Vitamin D3 and Vitamin K2 are generally fine to take together. D3 and K2 direct calcium to bone
Why do Vitamin D3 and Vitamin K2 interact?
D3 upregulates intestinal calcium uptake while K2 activates osteocalcin and matrix GLA protein, which shuttle calcium into bone matrix and away from soft tissue.
How strong is the evidence for this interaction?
The evidence is strong, supported by multiple published studies and clinical data.
About these supplements
Other Vitamin D3 interactions
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1 flagZinc and Iron compete for the same absorption pathway. Take at least 2 hours apart.
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This information is for educational purposes only. It is not medical advice and does not diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional.