Bloomberg News reported on June 18, 2025, that U.S. Health Secretary Robert F. Kennedy Jr. is considering asking a key government vaccine advisory panel to examine vaccines that contain aluminum ingredients.
This potential review creates significant regulatory uncertainty for pharmaceutical companies, including Merck, that produce vaccines containing aluminum. Many common vaccines use aluminum compounds as adjuvants to enhance immune response.
The move could lead to increased scrutiny, public concern, and potential policy changes regarding vaccine formulations. This development adds to the existing political and reputational risks for Merck's vaccine portfolio.
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