All COVID-19 vaccines were tested in clinical trials involving tens of thousands of people to make sure they meet safety standards and protect adults of different ages, races, and ethnicities. There were no serious safety concerns. CDC and the FDA will keep monitoring the vaccines to look for safety issues after they are authorized and in use. Safety is the most important requirement of the vaccine, and data from the clinical trials is assessed by independent experts on at least two important committees: the Vaccines and Related Biologics Products Advisory Committee (VRBPAC) and the Advisory Committee on Immunization Practices (ACIP).The FDA requires eight weeks of safety data on the vaccine. To date, from 30,000 to 50,000 individuals have been monitored for more than eight weeks after receiving the vaccine, and no serious side effects have been documented.