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Vitamin - Wikipedia
Vitamins and Minerals From A to Z - WebMD
Vitamin | Definition, Types, & Facts | Britannica
What Are Vitamins? - Healthline
Vitamins: MedlinePlus Medical Encyclopedia
Vitamins and Minerals – The Nutrition Source
What are vitamins, and how do they work? - Medical News Today
Vitamins & Supplements - WebMD
What Are Vitamins, and Why Are They Important? - Verywell Health
Vitamins - MedlinePlus