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  1. What Are Vitamins? - Healthline

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

  3. Listing of vitamins - Harvard Health

  4. Vitamins and Minerals From A to Z - WebMD

  5. Vitamin - Wikipedia

  6. Vitamins and Minerals – The Nutrition Source

  7. Vitamins & Supplements - WebMD

  8. Should You Take Vitamins Daily? - Cleveland Clinic Health Essentials

  9. Vitamins - MedlinePlus

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

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