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Alternative Names Return to topVitamin A toxicity
Definition Return to top
Hypervitaminosis A is having too much vitamin A in the body.
Causes Return to top
There are two types of vitamin A hypervitaminosis:
Chronic vitamin A toxicity develops after taking too much vitamin A for long periods.
Symptoms Return to top
Exams and Tests Return to top
Treatment Return to top
Treatment involves simply stopping the use of too much vitamin A.
Outlook (Prognosis) Return to top
Most people fully recover.
Possible Complications Return to top
Recent studies show that taking too much vitamin A during pregnancy can cause abnormal development in the fetus. Talk to your health care provider about eating a proper diet while you are pregnant.
When to Contact a Medical Professional Return to top
Call your health care provider if you think that you or your child may have taken too much vitamin A, or you have symptoms of excess vitamin A.
Prevention Return to top
To avoid hypervitaminosis A, avoid taking more than the recommended daily allowance of this vitamin. Recent emphasis on vitamin A and beta carotene as anti-cancer vitamins may contribute to chronic hypervitaminosis A, if people take more than is recommended.
References Return to top
Zile M. Vitamin A Deficiencies and Excess. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF. Kliegman: Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 45.Update Date: 6/17/2008 Updated by: Elizabeth H. Holt, MD, PhD, Assistant Professor of Medicine, Section of Endocrinology and Metabolism, Yale University. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.