Vitamin A Toxicity Definition Vitamin A toxicity, also known as hypervitaminosis A, is a state arising from excessive vitamin A in the body. Normally, sufficient quantities of vitamin A can be acquired from a balanced diet. No additional supplementation is necessary. Consuming large amounts of foods containing vitamin A is a common cause of vitamin A toxicity.  Overzealous use of vitamins, usually multi-vitamins, and drugs that are precursors of active vitamin A can lead to toxicity. This can lead to severe symptoms which may not cause any permanent damage if the source of high doses of vitamin A is discontinued. However, in pregnant women there is the risk of defects in fetal development which is permanent. Vitamin A Functions and Absorption Vitamins are vital nutrients required for proper growth, health, and development. Most of the vitamins are obtained from the diet. Taking too much of any vitamin can result in vitamin toxicity or hypervitaminosis. Vitamin A (retinol) is required for good vision and repair of the epithelial tissue that lines the cavities in the human body. Green leafy vegetables, yellow vegetables (like carrots), meats (like liver, kidney, milk, and fish oil), drug supplements and bright-colored fruits contain substances called ?-carotene … Continue reading Vitamin A Toxicity and Overdose