In recent weeks, reports have been circulating about severe reactions in people who've taken over-the-counter vitamin B6 ...

Hypervitaminosis A, or vitamin A toxicity, occurs when you have too much vitamin A in your body. This condition may be acute or chronic. Acute toxicity occurs after consuming large amounts of ...

This test can indicate whether you have adequate levels, are at risk of a vitamin D deficiency, or have levels that are too high. Levels that are too low or too high could be harmful to your health.