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  1. What Are Vitamins? - Healthline

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

  3. Vitamin - Wikipedia

  4. Vitamins: What are they, and what do they do? - Medical News …

  5. Vitamins and Minerals From A to Z - WebMD

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

  7. Vitamins & Supplements - WebMD

  8. Vitamins and Minerals | The Nutrition Source | Harvard T.H. Chan …

  9. Listing of vitamins - Harvard Health

  10. Vitamins: MedlinePlus