A vitamin megadose is a misnomer because at these levels,the vitamin is functioning as a drug rather than a nutrient.

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Both the statement and the reason are correct and related.Megadoses are sometimes advocated,but this practice is dangerous,and it should be supervised by a health care provider to ensure that toxicities do not occur.By definition,a megadose is more than 10 times the RDA.A well-established principle of pharmacologic therapy is that all substances are potentially toxic at large enough doses.Taking more than the Institute of Medicine's upper limit means that risks likely outweigh benefits.

A Vitamin Megadose Is a Misnomer Because at These Levels,the