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  1. Vitamin - Wikipedia

  2. Vitamins and Minerals From A to Z - WebMD

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

  4. What Are Vitamins? - Healthline

  5. Vitamins: MedlinePlus Medical Encyclopedia

  6. Vitamins and Minerals – The Nutrition Source

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

  8. Vitamins & Supplements - WebMD

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

  10. Vitamins - MedlinePlus