Getting too much preformed vitamin A (usually from supplements or certain medicines) can cause severe headache, blurred vision, nausea, dizziness, muscle aches, and problems with coordination. In severe cases, getting too much preformed vitamin A can even lead to coma and death.
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.
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.)
What happens if vitamin A is too high?
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.
Can you overdose vitamin A from food?
Pre-formed vitamin A is found in animal sources like fish oil, liver, and (to a lesser extent) milk and eggs. It is definitely possible to get too much of this form of vitamin A, especially if you're taking a lot of dietary supplements.
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