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I would advise against taking zinc lozenges. Zinc may at best shorten the duration of a cold caused by rhinovirae by 1 day. But the side effect may be a permanent loss of smell. AFAIK there are no studies showing it to have any measure-able effect on COVID. Chloroquine does not seem to be useful against COVID whatsoever. Initial studies of it were flawed and had a too small sample size. Taking Chloroquine probably does more harm than good.