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  1. Flu Shot Ingredients: What’s in It and Is It Safe? - Healthline

  2. Flu shot ingredients: What they contain and why - Medical News …

  3. Flu Shot Ingredients: Safety, Benefits, and Side Effects - Verywell …

  4. Ingredients in Influenza Vaccines - Children's Hospital of …

  5. Common Ingredients in FDA-Approved Vaccines | FDA - U.S.

  6. Flu Vaccine Ingredients 2023: What's In The Flu Shot, And Why?

  7. Feature Article — Flu Vaccine: What’s in the Vial?

  8. Vaccine Ingredients - HHS.gov