Medically reviewed by Sanja Jelic, MD Vitamins are classified as either fat-soluble or water-soluble based on how the body ...

Vitamin B6 can cause permanent damage to nerves. Studies have shown symptoms improved when the person stopped taking the ...

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.