Chloroquine's use to treat COVID-19 is backed by US government, but many questions remain
Is chloroquine or hydroxychloroquine useful in treating people with COVID-19, or in preventing infection in people who have been exposed to the virus? | Cochrane
Effective Tyrosinase Inhibition by Thiamidol Results in Significant Improvement of Mild to Moderate Melasma - ScienceDirect