Vitamin poisoning, or hypervitaminosis, refers to a condition of high storage levels of vitamins, which can lead to toxic symptoms. The medical names of the different conditions are derived from to the vitamin involved: an excess of vitamin A, for example, is called "hypervitaminosis A".
Some of the most common causes of poisoning are vitamins A, B3, B6 and D. Conversely, certain vitamins do not produce toxicity in excess levels: vitamin C has been used in clinical trials in dosages over 100 000 mg — over 1000 times the daily recommended intake — without ill effects.
Excess doses of mineral supplements can also lead to poisoning. Either or both of hypervitaminosis and mineral supplement poisoning can occur due to excessive intake of multivitamin supplements.
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