evidence: Unsupported: The nattokinase study cited was performed only in vitro, not in people, so it provides no information about nattokinase’s effect in people with long COVID. The exact cause of long COVID still remains unknown. The assertion that long COVID is due to persistent spike protein and can be treated with nattokinase is unsupported by scientific evidence. FULL CLAIM: "Dissolution of Spike Protein by Nattokinase: Holy Grail of COVID-19 Vaccine Detoxification"; "Nattokinase may destroy the spike protein. It makes sense that it would [...] I don’t know any details or specifics of nattokinase in this situation. It just makes sense."; long COVID persists due to persistent spike protein [...] Chiropractor Ben Lynch later posted a screenshot of McCullough’s Substack post on Facebook. In the caption of the post, he claimed that nattokinase "may destroy the spike protein". This claim, combined with Lynch’s allegation that the persistence of spike protein is the cause of long COVID, implied that nattokinase could be used to treat long COVID.