Verdict
Not enough evidence
Vitamin D3 works best when paired with vitamin K2.
2 sources: 2 positive
By Arun AgrahriLast reviewed 2 timecoded sources
Short answer
Probably, though it is less settled than the marketing suggests. Mark Hyman considers D3 and K2 inseparable, and Rhonda Patrick calls K2 a longevity vitamin under the triage theory. K2 does not appear in every bone-health protocol on the record.
Vitamin K2 is worth taking.
The verdict on Vitamin K2 overall. 2 sources: 2 positive
positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.
Vitamin D3 works best when paired with vitamin K2.
2 sources: 2 positive. Fewer than 3 sources so far.
Researchers say
2 positive
Mark Hyman, 2 mentions on this claim
Positive Video
on The Dr. Hyman Show, at 40:30 · positive
“you want to take it with other supplements magnesium which is important for vitamin D3 activation K2 also important”
on The Dr. Hyman Show, at 2:05:12 · positive
“vitamin k is a fat soluble vitamin that helps make sure that the calcium goes to your bones and not to your arteries”
Bryan Johnson, on Bryan Johnson's channel, at 02:46
Positive Video · Opinion
Open the tape at 02:46 →“Vitamin D helps absorb the calcium and direct it towards the site while vitamin K2 activates the proteins that bind calcium into the collagen matrix.”
Studies show
No study counted yet.
Mark Hyman Video · positive · 2 mentions
on The Dr. Hyman Show, at 40:30 · positive · Opinion
“you want to take it with other supplements magnesium which is important for vitamin D3 activation K2 also important”
on The Dr. Hyman Show, at 2:05:12 · positive · Opinion
“vitamin k is a fat soluble vitamin that helps make sure that the calcium goes to your bones and not to your arteries”
Bryan Johnson, on Bryan Johnson's channel, at 02:46 Video · positive · Opinion
“Vitamin D helps absorb the calcium and direct it towards the site while vitamin K2 activates the proteins that bind calcium into the collagen matrix.”
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Vitamin D3 may work best when paired with vitamin K2, though the case rests more on mechanism than on trials. Mark Hyman never recommends D3 alone and considers K2 inseparable from it. Rhonda Patrick explains it through the triage theory: the body prioritizes vitamin K1 for clotting at the expense of K2-dependent proteins that keep calcium out of arteries.
K2 is not on every list. Peter Attia's bone-health "big three" is calcium, D3 and magnesium, with no K2, which may reflect an evidence base for K2 that is still emerging.
Bryan Johnson calls D and K2 the workers that absorb calcium and bind it to bone. Without K2, calcium may settle in arteries instead.
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Full Vitamin K2 evidence report
The verdict on every claim, and where the sources disagree