Zinc. Evidence shows that if taken before exposure it reduces the risk of catching the cold, and if taken during the first 24 hours of symptoms it reduces the

Zinc. Evidence shows that if taken before exposure it reduces the risk of catching the cold, and if taken during the first 24 hours of symptoms it reduces the length and severity of the cold. Some evidence suggests it works for the SARS Coronaviruses too (i.e. not just Rhinoviruses) https://www.researchgate.net/publication/47794995_Zn_Inhibits_Coronavirus_and_Arterivirus_RNA_Polymerase_Activity_In_Vitro_and_Zinc_Ionophores_Block_the_Replication_of_These_Viruses_in_Cell_Culture https://www.researchgate.net/publication/47794995_Zn_Inhibit... Beware. Taking Zinc regularly, especially in the high doses necessary for the cold/flu resistance effect, is NOT a good idea. It leads copper deficiency and anemia.