Quercetin, Green tea, Black Tea, others?

Is there an effectiveness ranking for these? Do they require a combination of two or more to be more effective?

I ask because I have a quart or two of unsweet black tea daily. I also occasionally brew green tea. Quercetin is on order, and I have zinc though my diet is good and should have plenty already. Just want to have my knowledge correct on this.

Rumensin

I've read melatonin is a good one too.

Reveille doc has posted about these on his thread and Facebook. I'm doing a quercetin green tea daily since I read his post. Just if you have COVID don't do a vitamin D3 bomb like you would for Flu A. I made that mistake.