Quercetin has an EC50 value of 84 uM in vitro against SARS-CoV, Chloroquine around 6 uM vs SARS-CoV-2 and it's a lot better absorbed - so to get any antiviral e

Quercetin has an EC50 value of 84 uM in vitro against SARS-CoV, Chloroquine around 6 uM vs SARS-CoV-2 and it's a lot better absorbed - so to get any antiviral effect from quercetin you'd probably need at least 10 grams pr day.