Allergy Research Group Nattokinase 50mg 90cAllergy Research Group Nattokinase is a dietary supplement designed to support healthy blood circulation. Nattokinase is an enzyme derived from boiled soybeans and a select strain of Bacillus subtilis natto. This formulation is made with purified nattokinase that has been extracted through a patented process and has been tested to ensure it is both potent and safe.