Metformin suppresses SARS-CoV-2 in cell culture - PubMed
Anti-Viral Impact of Metformin “When AMPK was activated in Calu3 and Caco2 cell lines using metformin, there was a remarkable suppression of SARS-CoV-2 infectious titers, with up to 99% reduction observed in infected cells.”
Metformin suppresses SARS-CoV-2 in cell culture