hypervitaminosis

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 the vitamin involved: an excess of vitamin A, for example, is called hypervitaminosis A.

Generally, toxic levels of vitamins are achieved through high supplement intake and not from dietary sources. Toxicities of fat-soluble vitamins result also can be caused by a large intake of highly fortified foods, but foods rarely deliver dangerous levels of fat-soluble vitamins.

High dosage vitamin A; high dosage, slow release vitamin B3; and very high dosage vitamin B6 alone are sometimes associated with vitamin side effects that usually rapidly cease with supplement reduction or cessation.