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  1. Vitamins and Minerals From A to Z - WebMD

  2. Listing of vitamins - Harvard Health

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

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

  5. What Are Vitamins, and Why Are They Important? - Verywell Health

  6. What Are Vitamins? - Healthline

  7. Vitamins and Minerals – The Nutrition Source

  8. Vitamin - Wikipedia

  9. Essential vitamins | Description, List, Names, Functions, …

  10. Vitamins - MedlinePlus