Don't know your source, but this is the one I've used with satisfaction for many years:

https://www.swansonvitamins.com/q?kw=Quercetin+

https://www.swansonvitamins.com/q?kw=Liposomal+Glutathione (wow!)

I see that plain glutathione is available at a far more reasonable price (and many more customer reviews):

https://www.swansonvitamins.com/q?kw=glutathione

I use a wide array of more traditional herbs that have been around for centuries and most are quite inexpensive. I haven't even had a bad cold in many years (finding wood to knock on, LOL). Most of them simply boost or support our natural immune system.

KY...........