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Vitamins and Supplements - Colibri M
What Are Vitamins? - Healthline
Vitamin - Wikipedia
What are vitamins, and how do they work? - Medical News Today
Vitamins and Minerals From A to Z - WebMD
Listing of vitamins - Harvard Health
Vitamin | Definition, Types, & Facts | Britannica
Vitamins - MedlinePlus
Healthline Nutrition — Vitamins & Supplements
Essential Vitamins: Importance, Deficiencies, and Solutions