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What Are Vitamins? - Healthline
Vitamin - Wikipedia
Vitamins: What are they, and what do they do? - Medical News …
Vitamin | Definition, Types, & Facts | Britannica
Should You Take Vitamins Daily? - Cleveland Clinic Health Essentials
Listing of vitamins - Harvard Health
Vitamins and Minerals | The Nutrition Source | Harvard T.H. Chan …
Vitamins: MedlinePlus Medical Encyclopedia
Vitamins & Supplements - WebMD
Vitamins: MedlinePlus