“Vitamin K?”Here!vitamin K (phylloquinone/menaquinone)
Appears in 1 scanned product.
As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
A fat-soluble vitamin required for blood clotting and involved in bone metabolism. It occurs naturally as phylloquinone (vitamin K1, from leafy greens) and menaquinones (vitamin K2, from fermented foods and some animal products).
Why it’s used
Taken to support normal blood clotting function and, in some formulations, for its studied role in bone health.
What the evidence is for
supporting normal blood clotting.
What the evidence says
NIH ODS confirms vitamin K's established role in blood clotting, and deficiency is well documented to cause abnormal bleeding. Evidence for supplemental vitamin K improving bone density or fracture risk beyond preventing deficiency is more mixed, with some studies showing benefit and others showing none.
Dose studied
90–120 mcg — adult Adequate Intake levels, per NIH ODS.
Context
The adult Recommended Dietary Intake set by NIH ODS is in the range of 90 to 120 micrograms per day (as Adequate Intake); higher doses have been studied for bone-related outcomes with inconsistent results.
Rumors
Supporting normal blood clotting.
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.