Too much vitamin A can be harmful. Even a single large dose — over 200,000 mcg — can cause: Nausea. Vomiting.
How much is too much of vitamin A?
The tolerable upper intake of 3,000 mcg of preformed vitamin A, more than three times the current recommended daily level, is thought to be safe. However, there is some evidence that this much preformed vitamin A might increase the risk of bone loss, hip fracture [9-11], or some birth defects.
What happens if you have 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 causes 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 should I take a day?
CategoryVitamin A: Recommended Dietary Allowance (RDA) in micrograms (mcg) of Retinol Activity Equivalents (RAE)14 years and up700 mcg/dayPregnant14-18 years: 750 mcg/day 19 years and over: 770 mcg/dayBreastfeedingUnder 19 years: 1,200 mcg/day 19 years and over: 1,300 mcg/dayMALES
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