Summary

Vitamins are substances that your body needs to grow and develop normally. 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.

Learn More

• Facts about Vitamin K (University of Florida, Institute of Food and Agricultural Sciences)
• Find a Nutrition Expert (Academy of Nutrition and Dietetics)
• Hemorrhagic disease of the newborn (Medical Encyclopedia) Also in Spanish
• Protect Your Baby from Bleeds: Talk to Your Healthcare Provider about Vitamin K (Centers for Disease Control and Prevention) Also in Spanish
• Rare Clotting Factor Deficiencies (World Federation of Hemophilia)
• Vitamin K (Harvard School of Public Health)

Clinical Trials

• ClinicalTrials.gov: Vitamin K (National Institutes of Health)

Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)

• Article: Dual therapy with an oral non-vitamin K antagonist and a P2Y12...
• Article: Management of anticoagulated patients in dentoalveolar surgery: a retrospective study comparing...
• Article: Cost-Effectiveness of Direct Non-Vitamin K Oral Anticoagulants Versus Vitamin K Antagonists...
• Vitamin K -- see more articles

Patient Handouts

• Vitamin K (Medical Encyclopedia) Also in Spanish