REN and COVID-19: People with cardiovascular diseases and hypertension are more likely to develop severe complications from COVID-19, which is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), including hospital admission and death.1, 2, 3 Speculatively, angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs), both of which block the renin–angiotensin system (RAS), might affect people's susceptibility to COVID-19 and worsen its severity.