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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 Medical Encyclopedia There are 13 essential vitamins This means that these vitamins are required for the body to work properly They are: Vitamins are grouped into two categories: Fat-soluble vitamins are stored in the body's liver, fatty tissue, and muscles The four fat-soluble vitamins are vitamins A, D, E, and K