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Vitamin D toxicity, or hypervitaminosis D, is the toxic state of an excess of vitamin D.The normal range for blood concentration of 25-hydroxyvitamin D in adults is 20 to 50 nanograms per milliliter (ng/mL).
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.
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.
A blood sample will be drawn and analyzed to see whether you have a vitamin D deficiency. Levels below 30 nanomoles per liter (nmol/L) are considered low, while 50 nmol/L and above is considered ...
Vitamin A deficiency in the U.S. is rare, ... “Severe measles in children that have a vitamin A deficiency is very different than if you have adequate levels of vitamin A in your diet, which ...
Taking too much vitamin D can be toxic in rare cases, as with an 89-year-old U.K. man who died last year in part from vitamin D toxicity (though he did have several underlying conditions).
[49] [50] In 2008, the Australian Complementary Medicines Evaluation Committee recommended warning statements appear on products containing daily doses of 50 mg or more vitamin B 6 to avoid toxicity. [51] The relationship between the amount of vitamin B 6 consumed and the serum levels of those who consume it varies between individuals. [52]
Obesity sequesters vitamin D in fat tissues, thereby lowering serum levels, [41] but bariatric surgery to treat obesity interferes with dietary vitamin D absorption, also causing deficiency. [42] Medications include antiretrovirals, anti-seizure drugs, glucocorticoids, systemic antifungals such as ketoconazole, cholestyramine, and rifampicin.