Apparently vitamin C at extremely high doses acts as an antiviral drug, effectively inactivating viruses.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7318306/

Vitamin C exerts its antiviral properties by supporting lymphocyte activity, increasing interferon-α production, modulating cytokines, reducing inflammation, improving endothelial dysfunction, and restoring mitochondrial function (4–6). There are also suggestions that vitamin C may be directly viricidal (7).

Vitamin C administration has been related to enhanced interferon production and was studied for its possible use for the prevention of vaccine failure. Rabies vaccination, when supplemented with 2 g oral vitamin C for each of the 3 injections provoked, at 24 h, increased serum IFN-α levels, indicating that “vitamin C is an effective stimulator of interferon production” (94). Mice on an ad libitum diet containing vitamin C increased induction of interferon (62–145%) depending on the viral titer of inoculation (95), and L-ascorbate added to stimulated mouse cell lines increases interferon synthesis (96)."

Apparently vitamin C at extremely high doses acts as an antiviral drug, effectively inactivating viruses.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7318306/

Vitamin C administration has been related to enhanced interferon production and was studied for its possible use for the prevention of vaccine failure. Rabies vaccination, when supplemented with 2 g oral vitamin C for each of the 3 injections provoked, at 24 h, increased serum IFN-α levels, indicating that “vitamin C is an effective stimulator of interferon production” (94). Mice on an ad libitum diet containing vitamin C increased induction of interferon (62–145%) depending on the viral titer of inoculation (95), and L-ascorbate added to stimulated mouse cell lines increases interferon synthesis (96)."