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Today’s vaccines use only the ingredients they need to be safe and effective.
All vaccine ingredients serve a purpose. Find what goes into vaccines and what these ingredients do.
Components of VaccinesView components of vaccines by vaccine type, prepared using the Physician's Desk Reference and the manufacturer's package inserts.
Vaccines go through many years of safety and effectiveness testing. The Food and Drug Administration (FDA) looks at the results of these tests to decide whether to license the vaccine for use in the United States.
Learn more about vaccine safety
Immunization WebsitesUse these resources to find more science-based information that you can trust.
Vaccines must pass many phases of safety testing before they reach your child. They continue to be monitored for safety and efficacy even after they've been approved.
The Journey of your Child's Vaccine
CDC Tools for Vaccine ConversationResources for helping providers have conversations around vaccine safety and efficacy.
The Vaccine Adverse Events Reporting System (VAERS) is the U.S. frontline vaccine safety monitoring system, and providers play an important role in identifying and reporting potential adverse events to VAERS.
Report an Adverse Event
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