This vitamin also required for resistance to infection. Toxicity has been usually associated with abuse of vitamin A supplements rather than from ingestion of food sources.
Toxicity has been observed in people who have either chronically or acutely consumed more than 10 times the RDA. Some people take large doses of vitamin A hoping for improved vision, increased resistance to disease, improved skin and the like.
Acute hypervitaminosis A is caused by a single massive dose, or a limited number do large doses taken during a short period. Chronic hypervitaminosis A results from continued ingestion of high doses for month or even years.
Symptoms of hypervitaminosis A include dryness of the skin, headache, anorexia, weakness, hair loss, joint pain, vomiting, irritability, enlarge liver and spleen, and in babies, a bulging fontanelle and increase intracranial pressure.
What are the causes of hypervitaminosis A?
