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an abnormal state resulting from excessive intake of one or more vitamins
About the word:
The word vitamin (in part from Latin vita, meaning "life") dates back only to 1912. The study of vitamins was still in its infancy when the word hypervitaminosis emerged in 1928. (Hyper means "excessive.").
Two vitamins commonly implicated in hypervitaminosis are A and D, both of which are stored in the body, rather than excreted.