Most people with vitamin A toxicity have a headache and rash. Consuming too much vitamin A over a long period of time can cause coarse hair, partial loss of hair (including the eyebrows), cracked lips, and dry, rough skin. Chronic consumption of large doses of vitamin A can cause liver damage.
What are symptoms of too much vitamin A?
Too much vitamin A can be harmful. Even a single large dose — over 200,000 mcg — can cause: Nausea. Vomiting.Bone thinning.Liver damage.Headache.Diarrhea.Nausea.Skin irritation.Pain in the joints and bone.Birth defects.
Can too much vitamin A cause toxicity?
Vitamin A toxicity can be caused by ingesting high doses of vitamin A—acutely (usually accidentally by children) or chronically (eg, as megavitamin therapy or treatment for skin disorders). Acute toxicity causes rash, abdominal pain, increased intracranial pressure, and vomiting.
What can cause elevated 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.
How much vitamin A is toxic?
The acute toxic dose of vitamin A is 25,000 IU/kg, and the chronic toxic dose is 4000 IU/kg every day for 6-15 months. (Beta-carotene [ie, provitamin A] is converted to retinol but not rapidly enough for acute toxicity.)
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