There is not enough research to indicate that nattokinase is safe for pregnant or breastfeeding women. Verywell Health's content is for informational and educational purposes only. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.  that’s responsible for natto fermentation. These days,

Nattokinase is an enzyme (protein) found hinein natto, a traditional Japanese dish made from fermented soybeans. Also sold as a dietary supplement to promote heart health, nattokinase side effects are generally mild, but it may increase the risk of bleeding. This website is using a security service to protect itself from online attacks. The acti