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Vitamin K
Vitamin K
Low concern
Vitamin K is essential. NIH ODS notes no UL has been established due to low toxicity; however, vitamin K can interact with anticoagulants such as warfarin.
Found in
387 products
What it is
Fat-soluble vitamin (phylloquinone, K1; menaquinones, K2) essential for blood clotting and bone metabolism.
Nutrient/fortificant; naturally present in leafy greens and fermented foods.
Why it's flagged
- interacts with warfarin
What regulators actually say
"Vitamin K... has very low toxicity, and no UL has been established."
Regulatory status
United States — FDA
Permitted nutrient; phytonadione GRAS for foods (21 CFR 184).
European Union — EFSA
Authorized vitamin in food supplements (Reg. 1925/2006 Annex I/II).
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