The most common cause of chronic vitamin A toxicity is the regular ingestion of over 100,000 IU daily, which is sometimes prescribed for dermatological conditions such as acne.
What is most likely to cause vitamin A toxicity?
Some dietary supplements also contain vitamin A. Supplements are the most common cause of vitamin A toxicity. It tends not to occur just from eating vitamin A-rich foods. Too much vitamin A can make you sick.
What is the most common cause of vitamin toxicity in the US?
Vitamin D toxicity is usually caused by large doses of vitamin D supplements — not by diet or sun exposure. That's because your body regulates the amount of vitamin D produced by sun exposure, and even fortified foods don't contain large amounts of vitamin D.
What causes excess of vitamin A?
Causes of hypervitaminosis A Excess amounts of vitamin A are stored in your liver, and it accumulates over time. Most people develop vitamin A toxicity by taking high-dose dietary supplements, possibly due to megavitamin therapy.
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