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

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

  3. Vitamins: MedlinePlus Medical Encyclopedia

  4. What Are Vitamins? - Healthline

  5. Vitamin - Wikipedia

  6. Vitamins and Minerals From A to Z - WebMD

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

  8. Vitamins- Definition, Types and Sources of Vitamins - BYJU'S

  9. Vitamins – Classification, Source, Importance, Example

  10. Definitions of Health Terms: Vitamins - MedlinePlus