Vitamin A Toxicity (Hypervitaminosis A)
Check and manage Vitamin A Toxicity (Hypervitaminosis A)
A vitamin A blood test checks retinol, the main form of vitamin A in your blood.
A high result can mean your body has more vitamin A than it can safely handle. Your clinician may review supplements, medicines, diet, symptoms, and repeat testing if needed.
Monitoring matters because vitamin A is stored in body fat and the liver. Levels can stay high after extra intake stops. Repeat testing can show whether your level is moving toward a safer range.
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What is Vitamin A Toxicity (Hypervitaminosis A)?
If you take vitamin A supplements, acne medicines, or certain skin products, a high level can happen quietly.
Vitamin A toxicity means too much retinol builds up in your body. It can affect your skin, head, bones, liver, and nerves.
Symptoms
- Headache or dizziness.
- Nausea, vomiting, or belly pain.
- Dry, itchy, or peeling skin.
- Hair loss or brittle hair.
- Joint pain or bone pain.
- Blurred vision or eye irritation.
- Tiredness or weakness.
- Confusion or mood changes.
Causes and risk factors
- Taking high dose vitamin A supplements.
- Using more than 1 product that contains vitamin A.
- Taking retinoid medicines for acne or skin disease.
- Eating large amounts of liver or liver oils.
- Having liver disease, which can affect vitamin A storage.
- Being pregnant, since excess vitamin A can harm a developing baby.
How it's diagnosed
A vitamin A blood test checks retinol, the main form of vitamin A in your blood.
A high result can mean your body has more vitamin A than it can safely handle. Your clinician may review supplements, medicines, diet, symptoms, and repeat testing if needed.
Treatment options
Management often starts with finding every source of vitamin A. Your clinician may advise stopping supplements, changing medicines, or checking liver tests. Do not stop prescribed retinoids without medical guidance.
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Frequently asked questions
A blood test can measure retinol, the main vitamin A form in your blood. Your clinician may also review symptoms, supplements, medicines, and diet.
Safe ranges can vary by lab, age, pregnancy status, and health history. Your result should be reviewed with the reference range on your lab report.
Yes, high vitamin A can affect the liver, bones, skin, and nervous system. Severe symptoms need prompt medical care.
Common symptoms include headache, nausea, dizziness, dry skin, hair loss, and joint pain. Some people also notice vision changes or confusion.
The most common cause is taking too much preformed vitamin A from supplements or retinoid medicines. Eating large amounts of liver can also raise intake.
Ask your clinician before changing supplements or medicines. They may want to know your usual intake before checking your level.
Your clinician decides based on your result, symptoms, and intake sources. Repeat testing may show whether your level is moving down.
Beta carotene from foods usually does not cause classic vitamin A toxicity. Preformed vitamin A from supplements, liver, and retinoid medicines carries more risk.