Just looked on Amazon, lots of brands. What do you use and how many FU/day?
https://www.amazon.com/gp/product/B0B6CQ9ZVJ/ref=ox_sc_saved_title_7?smid=A1F7K7BKX235X3&psc=1
Nattokinase Supplement, 4,000 FU per Serving
Doublewood Supplements brand