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Toxicity results from ingesting too much preformed vitamin A from foods (such as liver), supplements, or prescription medications and can be prevented by ingesting no more than the recommended daily amount. Diagnosis can be difficult, as serum retinol is not sensitive to toxic levels of vitamin A, but there are effective tests available.
Hypervitaminosis is a condition of abnormally high storage levels of vitamins, which can lead to various symptoms as over excitement, irritability, or even toxicity. Specific medical names of the different conditions are derived from the given vitamin involved: an excess of vitamin A, for example, is called hypervitaminosis A.
Only consumption of retinol-containing dietary supplements can result in acute or chronic toxicity. [6] Acute toxicity occurs after a single or short-term doses of greater than 150,000 μg. Symptoms include blurred vision, nausea, vomiting, dizziness and headache within 8 to 24 hours.
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In 2013, researchers at Johns Hopkins University published an editorial titled “Enough Is Enough: Stop Wasting Money on Vitamin and Mineral Supplements,” with one of the editorial’s authors ...
Retinol, also called vitamin A 1, is a fat-soluble vitamin in the vitamin A family that is found in food and used as a dietary supplement. [3] Retinol or other forms of vitamin A are needed for vision, cellular development, maintenance of skin and mucous membranes , immune function and reproductive development. [ 3 ]
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Current World Health Organization guidance recommends biannual vitamin A supplementation for children aged 6 to 59 months in areas with high levels of retinol deficiency. [30] Children aged 6-12 months should receive a dose of 100,000 IU and children aged 1-5 years should receive a dose of 200,000 IU each time. [29]