This is a blurb from a post online that I found from a doctor who also specializes in natural medicine. I closed the link and unable to find again, but I did copy and past part of the information for a friend. Here is the information below, its about replacing Hydroxy-Chloroquine with Quercetin. Like Chloroquine, Quercetin acts as an ionophore agent that penetrates the Covid19 virus outer lining, to allow the Zinc inside, where the Zinc then stops the replication of the virus. No side affects from Quercetin as with Chloroquine. In addition Ive read a lot about High Dose Vitamin D3 with Vitamin K2 (m4 or m7), which really helps your immune system. "Quercetin + Zinc + Niacin + Selenium May Be a Winning Combo - If you wanted to try a holistic version of Zelenko�TMs COVID-19 protocol, you could use a natural antibiotic such as oil of oregano, quercetin (as a zinc ionophore in lieu of chloroquine) along with oral zinc (Chris Masterjohn recommends11 taking 7 mg to 15 mg of zinc four times a day, ideally on an empty stomach). Should zinc turn out to be in short supply, consider eating more zinc-rich foods.12 Examples include hemp, sesame and pumpkin seeds, cacao powder, cheddar cheese, and seafood such as oysters, Alaskan crab, shrimp and mussels. To this you could also add niacin (vitamin B3) and selenium, as both play a role in the absorption and bioavailability of zinc in the body. For example, a study13 published in 1991 demonstrated that when young women were on a vitamin B3-deficient diet, their serum zinc declined, suggesting B3 deficiency affected zinc metabolism such that “absorbed zinc was not available for utilization.” A more in-depth exploration and explanation of both niacin and selenium�TMs relationship to zinc is provided in the 2008 paper, “Zinc, Metallothioneins and Longevity: Interrelationships With Niacin and Selenium”:14
This is not the same article, but the same site I found the information on. This page is EXTREMELY thorough in its explanation of how Quercetin works.