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Phytonadione (Vitamin K1)

Also known as: Vitamin K1, Phylloquinone

Safe

Phytonadione is the standard form of vitamin K used for fortification and supplementation; vitamin K is essential for blood clotting and bone health. It is permitted by the FDA as a nutrient and has a long-established safety record.

Type

vitamin

What it is

The synthetic form of vitamin K1, identical to the phylloquinone found in green leafy plants.

Used as a vitamin K fortificant in infant formula, medical foods, and supplements.

Why it's flagged

Interacts with vitamin K antagonist anticoagulants (e.g., warfarin)

Regulatory status

United States — FDA

Permitted nutrient (21 CFR 184.1)

European Union — EFSA

Authorised vitamin

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