Ask the doctor: Can I take nattokinase instead of warfarin?

Ask the doctor

Can I take nattokinase instead of warfarin?

Q. I would like to find a safer, easier alternative to warfarin, which I have been taking for a couple of years. I have been hearing about nattokinase "" can I take it in place of warfarin?

A. Nattokinase, an enzyme extracted from fermented soybeans, helps dissolve blood clots "" in test tubes. But there's barely a scrap of evidence showing that taking nattokinase or eating natto (the fermented beans themselves) breaks up blood clots in human arteries or prevents them from forming in the first place.

To continue reading this article, you must login.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »