Yup I suspected it was because it was rich in quercitrin, so I looked it up to confirm. Just don’t use it if you’re allergic to ragweed.
I take quercetin frequently with zinc now and likely will for the rest of my life. Used it heavily when I got the Coo as did my immediate and extended family on my recommendation.
I cannot find a full comparative study, but what I have read indicates that it is quite close to the efficacy or function of HCQ as a zinc-ionophore. It is also a powerful anti-oxidant.
I’m allergic to ragweed, or at least I used to be, and I take quercetin every evening with zinc.