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Nattokinase is found almost exclusively in the United States in capsule or tablet form. Doses are often described in fibrin units (FU), with 2,000 FU translating to roughly 100 milligrams and 3,000 FU translating to 150 milligrams.
There are no universal guidelines for the appropriate use of nattokinase. Doses of up to 3,000 FU have been used safely for up to 26 weeks, although most manufacturers recommend no more than 2,000 FU per day.
In addition to supplements, you can also obtain nattokinase by adding natto to your diet. There are small producers in the United States who ship fresh natto directly to consumers and health food stores. You can also make your own by purchasing Bacillus subtilis natto spores online. *