fibrinolytic activity. Ingestion of vitamin K2 (menaquinone-7) will help coagulant activity and prevent 31.32 Natto contains the phytoestrogens (isoflavones) that originate in soybeans.33,34 Isoflavones seem to have preventive effects on breast and prostate cancer, osteoporosis, menopausal symptoms, and heart disease.33,34