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  1. Vitamins and Supplements - Colibri M

  2. What Are Vitamins? - Healthline

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

  4. Listing of vitamins - Harvard Health

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

  6. Vitamin - Wikipedia

  7. Vitamins and Minerals From A to Z - WebMD

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

  9. B Vitamins: Types, Benefits and Side Effects - Cleveland Clinic …

  10. Vitamins - MedlinePlus