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Vitamin

Vitamin K2

Vitamin K2 is a family of fat-soluble menaquinones, made by bacteria and found in fermented foods such as natto and cheese. With K1, it is a main natural form of vitamin K.

Also listed as Vitamin K-2, Vitamin K, Phylloquinone, Menaquinone

Bone & JointEssential HealthCardiovascularOrgan Function

The interaction that matters most

Vitamin K can dangerously alter treatment with warfarin or phenprocoumon. Consistent intake matters; changes in food or supplements should be discussed with the treating clinician. 1

Is there an upper limit?

The US Food and Nutrition Board has not set an upper limit because toxicity is low. That does not remove the anticoagulant interaction. 1

Pregnancy and newborns are different situations

DGE lists 60 µg daily during pregnancy and breastfeeding. Newborn prophylaxis addresses a distinct risk of vitamin K deficiency and is not interchangeable with an adult dietary target. 2

For information, not individual medical advice. Ingredient studies do not establish the effectiveness of these products.

Sources

  1. Vitamin K: Fact Sheet for Health Professionals NIH Office of Dietary Supplements