Vitamin K
Vitamins & MineralsCAS: 84-80-0
This is what the ingredient is.
Vitamin K (phylloquinone, menaquinone) is a fat-soluble vitamin essential for blood clotting and bone health.
Here is why it shows up on the label.
It works as a nutrient. Found naturally in greens; added to infant formula and some supplements.
Here is what food agencies say.
US agencies treat it as an essential nutrient. No established UL due to low toxicity risk.
Here is what research has found.
Essential for blood coagulation. K2 form may support bone health. Deficiency rare in healthy adults.
Here are a few things worth knowing.
Interacts significantly with warfarin/blood thinners. Maintain consistent intake if on anticoagulants.
Sources
- FDA
- NIH ODS
How to read this page
We publish plain facts about this ingredient so a label is easier to read. This is not medical advice, and it is not a recommendation to buy, avoid, or use anything. For a personal health question, talk with a clinician who knows your history.
v1.0Updated 9/12/2026