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Vitamins and Minerals From A to Z - WebMD
Listing of vitamins - Harvard Health
Vitamin | Definition, Types, & Facts | Britannica
What are vitamins, and how do they work? - Medical News Today
What Are Vitamins, and Why Are They Important? - Verywell Health
What Are Vitamins? - Healthline
Vitamins and Minerals – The Nutrition Source
Vitamin - Wikipedia
Essential vitamins | Description, List, Names, Functions, …
Vitamins - MedlinePlus