@ikuo1000 https://pmc.ncbi.nlm.nih.gov/articles/PMC8493111/ would be 80% protective in the simple model, but also "formal study with medical professionals as subjects", so better than generally expected. (1 - 0.2)^10 ≅11% chance of avoiding infection.
This one https://www.sciencedirect.com/science/article/pii/S1386653222001809 gets a 60% reduction.
This is not a deeply studied area. It's very likely anything reducing viral replication in your nose helps when infected, but how much exactly is not firmly established. Prevention is preferable.
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