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* liver enzyme abnormalities
* liver injury
* headaches
* nausea
* bone problems
* dry or peeling skin
The risk mainly applies to high-dose supplements containing preformed vitamin A rather than beta-carotene naturally found in fruits and vegetables.
The NIH Office of Dietary Supplements specifically warns that excessive preformed vitamin A can damage the liver.
### Be especially careful if:
* you take multiple supplements containing vitamin A
* you use high-dose retinol products
* you already have liver disease
* you regularly consume large amounts of alcohol
More vitamin A is not necessarily better.
## 2. Vitamin D
Vitamin D plays an important role in bones, muscles, immunity, and calcium regulation.
