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Excess Vitamin A

Summary of Excess Vitamin A
Hypervitaminosis A refers to the toxic effects of ingesting too much preformed vitamin A. Symptoms arise as a result of altered bone metabolism and altered metabolism of other fat-soluble vitamins. Most people make a full recovery. High intake of provitamin carotenoids, such as beta carotene, from vegetables and fruits, does not cause hypervitaminosis A.

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Excess Vitamin A

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Excess Vitamin A

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Hypervitaminosis is mostly caused by excess ingestion of foods such as animal liver, supplements or medications such as isotretinoin. 

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A 26-year-old woman comes to the office because she has recently started to experience hip pain. She is an active runner, but has not changed her exercise routine lately. She has also had blurry vision, and has an upcoming appointment with the optometrist. Her last vision check was last year. She has also noticed peeling skin and hair loss, which she attributed to the cold winter temperatures, but there has been no improvement despite moisturizing and increasing her multivitamin dose. She takes insulin for type 1 diabetes, a daily multivitamin, and several tablets of cod liver oil supplements daily. Excess of which of the following is most likely responsible for this patient's symptoms?