Expert Answer
Should you take vitamin D with K2?
Quick Answer
3 of 5 experts say yes. Hyman considers D3 and K2 inseparable. Patrick calls K2 a 'longevity vitamin' via Triage Theory. But Attia omits K2 from his bone health protocol entirely, and Huberman has zero coverage.
Moderate Consensus
on Vitamin K2 overall
What Researchers Say
Never recommends D3 alone. D3+K2 is one of his top 3 foundational supplements.
“typically we want about 180 micrograms of vitamin k2 in a supplement, and there are many vitamin d supplements that have that k with it”
Mark Hyman, on the record @ 02:05:21
Calls K2 a 'longevity vitamin' via Triage Theory - K2 benefits are sacrificed during deficiency.
“mk7 has a longer half life, I personally take mk7, I take 50 micrograms a day”
Rhonda Patrick, on the record @ 48:03
Takes D3K2 daily. Describes D and K2 as 'workers that facilitate calcium binding to bones.'
Detailed Answer
The D3+K2 pairing reveals one of the most interesting expert splits. Hyman never recommends D3 alone - he considers K2 inseparable. Patrick explains via Triage Theory that the body prioritizes K1 for clotting at the expense of K2-dependent proteins that prevent arterial calcification.
The notable absence: Attia defines bone health as "the big three: calcium, D3, and magnesium" across 5+ episodes - K2 is never mentioned. Huberman has zero K2 coverage. This likely reflects the emerging evidence base for K2 not yet meeting their threshold.
Johnson describes D and K2 as "the workers that facilitate calcium absorption and binding" to bones - without K2, calcium may deposit in arteries.
Related Questions
What form of K2 should I take?
MK-7 (menaquinone-7) is preferred due to longer half-life. Combined D3/K2 supplements are the most practical format.
Who should NOT take K2?
Anyone on warfarin or other vitamin K antagonist blood thinners must consult their physician first.
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