Media Bias Fact Check (MBFC) publishes daily vetted fact checks from verified IFCN-approved sources. Each claim is independently reviewed for accuracy and context.
Claimant: Robert F. Kennedy Jr.
Claim: Scientists previously were not studying the risks of vaccines, so “we don’t know” their risks.
Rating: FALSE
Explanation: Vaccines undergo safety testing in clinical trials before authorization or approval and continue to be monitored afterward. Researchers have studied vaccine safety for decades, including through placebo-controlled trials when appropriate and multiple post-market surveillance systems.
Date: 09/22/2026
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Last Updated on September 22, 2026 by Media Bias Fact Check