How do I know the COVID-19 vaccines are safe?

The COVID-19 vaccines have received the most intense safety monitoring in U.S. history, which has allowed public health officials to make science-based recommendations that keep people safe.

All COVID-19 vaccines have been rigorously tested and reviewed. The vaccine’s clinical trials three-phase process was detailed and thorough, and no shortcuts were taken. More than 150,000 people participated in U.S. clinical trials of the vaccines, and now, hundreds of millions of vaccine doses in the U.S. have been safely administered. Data from trial will continue to be collected for two years after each vaccine is first administered to ensure that they are safe for the long term. As with all vaccines, there will be ongoing monitoring for adverse events among people who are vaccinated into the future.

Updated October 12, 2021