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  1. Vitamin - Wikipedia

  2. What Are Vitamins? - Healthline

  3. Vitamin | Definition, Types, & Facts | Britannica

  4. Vitamins and Minerals From A to Z - WebMD

  5. Vitamins and Minerals | The Nutrition Source | Harvard T.H ...

  6. What are vitamins, and how do they work? - Medical News Today

  7. Listing of vitamins - Harvard Health