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

  2. Vitamin - Wikipedia

  3. What Are Vitamins? - Healthline

  4. Listing of vitamins - Harvard Health

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

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

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

  8. Vitamins: MedlinePlus

  9. Vitamins & Supplements - WebMD

  10. Vitamins and Minerals | NCCIH