Too much vitamin A can be harmful. Even a single large dose — over 200,000 mcg — can cause: Nausea. Vomiting.
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 you take too much vitamin A?
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 is the maximum amount of vitamin A you can take?
The bottom line Both deficiency and surplus intake may cause severe side effects. Therefore, while it's crucial to meet the RDA of 700–900 mcg daily for adults, it's also essential not to exceed the daily upper limit of 3,000 mcg.
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