The U.S. Food and Drug Administration (FDA) ensures all food and drugs are safe. COVID-19 vaccines must pass clinical trials like other drugs and vaccines and are only approved if they are safe and effective.
The FDA keeps checking safety through the Vaccine Adverse Events Reporting System (VAERS). Healthcare providers are required to report serious side effects or if someone gets seriously ill with COVID-19. There is also a smartphone-based health checker called V-SAFE that uses text messaging and web surveys to do health check-ins after people receive a COVID-19 vaccination.