“A new groundbreaking study from the University of Michigan reveals several drug contenders already in use for other purposes—including one dietary supplement—that have been shown to block or reduce SARS-CoV-2 infection in cells.  The team validated the 17 candidate compounds in several types of cells, including stem-cell-derived human lung cells in an effort to mimic SARS-CoV2 infection of the respiratory tract.  Nine showed anti-viral activity at reasonable doses, including lactoferrin, a protein found in human breastmilk that is also available over the counter as a dietary supplement derived from cow’s milk.”

The link to the study is in the first comment.