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https://www.covid-19forum.org/index.php?topic=227.0While neither quercetin or EGCG performs the several important functions that hydroxychloroquine does, EGCG (Epigallocatechin Gallate) an extract from green tea, like Quercetin, is another zinc ionophore that can transport zinc through the cell wall and into the cell, where it inhibits the replication of the virus. Though not mentioned as much, if quercetin weren't available this might be the next best fall-back to consider as prophylaxis taken with a zinc supplement.
