Vitamin K — answers to vitamin K (phylloquinone/menaquinone)
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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.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.