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What Are Vitamins? - Healthline
What are vitamins, and how do they work? - Medical News Today
Listing of vitamins - Harvard Health
Vitamins and Minerals From A to Z - WebMD
Vitamin - Wikipedia
Vitamins and Minerals – The Nutrition Source
Vitamins & Supplements - WebMD
Should You Take Vitamins Daily? - Cleveland Clinic Health Essentials
Vitamins - MedlinePlus
What Are Vitamins, and Why Are They Important? - Verywell Health