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Vitamin | Definition, Types, Facts | Britannica All vertebrates, including humans, require dietary sources of vitamin A, vitamin D, thiamin, riboflavin, vitamin B 6, and pantothenic acid; some vertebrates, particularly the more highly evolved ones, have additional requirements for other vitamins
Vitamins - MedlinePlus Vitamins are substances that your body needs to grow and develop normally There are 13 vitamins your body needs; Each has specific jobs