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  1. Vitamin - Wikipedia

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

  3. Vitamins and Minerals From A to Z - WebMD

  4. What Are Vitamins? - Healthline

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

  6. Vitamins: MedlinePlus Medical Encyclopedia

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

  8. Vitamins - MedlinePlus

  9. Vitamins and Minerals – The Nutrition Source

  10. Vitamin and Mineral Supplement Fact Sheets - Office of Dietary ...