Q&A: Coumadin-Supplement Interactions

by Dr. Stephen Sinatra

Filed Under: Q&As, Heart Health

Last Reviewed 12/26/2012

Q&A: Coumadin-Supplement Interactions

What supplements can or can't I take while on Coumadin?

Drug-supplement interactions with Coumadin (warfarin) include

St. John's wort
Garlic
Nattokinase
Vitamin K

You shouldn't take these at all while taking Coumadin (warfarin).

Also, don't take more than 200 IU of mixed tocopherols (vitamin E) or 2 grams of fish oil.

You'll still want to eat green leafy vegetables for dietary vitamin K, but make sure that your INR (a measure of your blood's clotting ability) is checked routinely by your doctor, and that your Coumadin dosage is adjusted as needed.

WATCH: Learn More About the Only Time It's Safe to Discontinue Coumadin

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Meet Dr. Sinatra

Dr. Stephen Sinatra is a highly respected and sought-after cardiologist and nutritionist with more than 30 years of clinical practice, research, and study. His integrative approach to heart health focuses on reducing inflammation in the body and maximizing the heart's ability to produce and use energy. More About Dr. Sinatra