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.
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.

Cautions

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

Vitamin K Categories:

Vitamin K
Vitamin K health
Vitamin K deficiency
Vitamin K sources
Vitamin K recommended daily
Vitamin K overdose
Vitamin K supplements
Vitamin K interactions

Other Vitamins:

Vitamin A
Carotenes
Beta carotene
Lycopene
Lutein
Thiamin
Riboflavin
Niacin
Vitamin B6
Folate
Vitamin B12
Biotin
Pantothenic acid
Vitamin C
Vitamin D
Vitamin E
Vitamin K