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.
Vitamin D toxicity is unusual from food
