“Vitamin K (menaquinone)?”Here!vitamin K2
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As a supplement
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Menaquinone, also called vitamin K2, is one of the two natural forms of vitamin K (the other being phylloquinone, or K1). It is found in fermented foods and some animal products and is also produced by gut bacteria.
Why it’s used
Taken to support normal blood clotting and, in some formulations, to support bone health.
What the evidence is for
normal blood clotting function.
What the evidence says
NIH's Office of Dietary Supplements describes vitamin K's established role in blood clotting as well documented. Evidence for menaquinone specifically supporting bone health is more limited; some studies, largely from Japan where menaquinone-7 is more extensively studied, suggest a role in bone metabolism, but results are not consistent across all trial populations.
Dose studied
0.045–45 mg — range across studies examining bone-related outcomes, far exceeding typical dietary intake at the high end.
Context
Bone-related studies have used menaquinone doses in the range of roughly 45 mg per day in some Japanese trials, far above typical dietary intake, while other studies have used much smaller amounts; results have not been uniformly replicated in other populations.
Rumors
Normal blood clotting function.
Supports — establishedhealth and safety evidence
Measured as a biomarker.
- Vitamin K - Health Professional Fact Sheet (Regulatory) · Funding not checked
How much is a reference amount
- 90 mcg a dayfor adults 19 and over, women · Adequate Intake
No upper limit has been set — the data was not sufficient to set one, which is a gap in the research rather than a finding about safety.
- 120 mcg a dayfor adults 19 and over, men · Adequate Intake
No upper limit has been set — the data was not sufficient to set one, which is a gap in the research rather than a finding about safety.
An AI, set on phylloquinone (K1) intakes. It is applied to the menaquinone rows because it is the vitamin K AI and panels declare them as vitamin K; the FNB did not set separate values per form. No UL.
Every applicable line is shown because we don’t know which one is yours, and a reference intake is a target for a population, not a threshold for harm.