OTC nasal spray seemed to cut COVID infections by 67% in mid-sized trial - Ars Technica

Still, with the previous studies, the trial offers some hope that this accessible nasal spray could be used as a viral prophylactic for respiratory seasons in the future. And the results land at a time when access to COVID-19 vaccines—which have firmly proven to be safe and highly effective—has been severely restricted in the US by health secretary and anti-vaccine activist Robert F. Kennedy Jr.