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How many mg of vitamin A is toxic?

【Expert answer】

Created: 2022-06-28 22:48:12

Any Q

Taking more than 10,000 mcg a day of oral vitamin A supplements long term can cause: Bone thinning. Liver damage. Headache.


How much vitamin A is considered 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.)

How much vitamin A IU is toxic?

The daily biological need for vitamin A is estimated to be 800 retinol equivalents (RE)/d (2667 IU/d) for adult women and 1000 RE/d (3300 IU/d) for adult men; doses > or = 7500 RE (> or = 25000 IU)/d are considered potentially toxic over the long term.

What is the maximum amount of vitamin A you can take?

AgesUpper LimitChildren 4–8 years900 mcgChildren 9–13 years1,700 mcgTeens 14–18 years2,800 mcgAdults 19 years and older3,000 mcg

Is 3000 mcg of vitamin A too much?

Levels of up to 10,000 IU (3,000 mcg) have been considered safe. Beyond that, though, vitamin A can build up to cause liver damage and brain swelling; pregnant women who ingest too much run the risk of fetal damage.

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