Vitamin K helps your body by making proteins for healthy bones and tissues. It also makes proteins for blood clotting. If you don't have enough vitamin K, you may bleed too much.
Newborns have very little vitamin K. They usually get a shot of vitamin K soon after they are born.
If you take blood thinners, you need to be careful about how much vitamin K you get. You also need to be careful about taking vitamin E supplements. Vitamin E can interfere with how vitamin K works in your body. Ask your health care provider for recommendations about these vitamins.
There are different types of vitamin K. Most people get vitamin K from plants such as green vegetables, and dark berries. Bacteria in your intestines also produce small amounts of another type of vitamin K.
- Important Information to Know When You Are Taking: Warfarin (Coumadin) and Vitamin K (National Institutes of Health, Clinical Center) - PDF Available in Spanish
- What Is Combined Deficiency of Vitamin K-Dependent Clotting Factors? (World Federation of Hemophilia)
- ClinicalTrials.gov: Vitamin K (National Institutes of Health)
Journal ArticlesReferences and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Find a Registered Dietitian Nutritionist (Academy of Nutrition and Dietetics)