The NIH on quercetin and ecgc’s zinc ionophore properties:
https://pubmed.ncbi.nlm.nih.gov/25050823/
Zinc having been proved over and over to help limit covid in vitro, in vivo, in clinical settings, before admission to hospitals, during hispital stays, intubation or not (iirc), duration, death, etc.
So quercetin helps zinc enter cells and do that.
And quercetin is effectively kale extract.
I’ll be fine.