Vitamin K interactions with other nutrients

High intake of vitamin E (above 400 mg alpha TE (600 IU)) and vitamin A may antagonize vitamin K action and lead to an increased risk of hemorrhage.

Vitamin K interactions with drugs

X rays and radiation, aspirin, cholestyramine, the anticonvulsant phenytoin and mineral oil laxatives can raise vitamin K requirements. Some snake venoms act by destroying vitamin K, thus causing uncontrolled bleeding. Vitamin K may be injected to stop the bleeding.
Vitamin K interactions with other nutrients Long-term use of antibiotics may produce vitamin K deficiency as these drugs can kill not only harmful bacteria but also the beneficial bacteria which produce vitamin K.


Vitamin K supplements can interfere with the action of anticoagulant drugs such as warfarin.

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Vitamin K
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Vitamin K interactions



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