Hypervitaminosis: The deleterious effects of vitamins on the skin.

Vitamin supplementation has recently shown a dramatic increase in usage, especially during the COVID-19 pandemic, as a potential aid in preventing, treating, and recovering from infection. In dermatology, vitamin supplements may be used to support the management of a myriad of conditions. A common misconception is that vitamins are safe to consume and that taking more will improve overall health; however, hypervitaminosis may lead to harmful effects. We provide an overview illustrating the use of vitamins A, D, E, niacin, and biotin in dermatology and the potential adverse effects of hypervitaminosis.