Noun
an abnormal condition resulting from taking vitamins excessively; can be serious for vitamins A or D or K
Source: WordNetRetinoid overdose (toxicity) :see Hypervitaminosis A for details The Tolerable Upper Intake Level (UL) for vitamin A, for a 25-year-old male, is 3,000 micrograms/day, or about 10,000 IU. Source: Internet