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MedlinePlus is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH). It was built as an online health information resource for patients and their families and friends.

MedlinePlus presents high-quality, easy to understand, relevant health and wellness information that is trusted.

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Vitamin A - National Library of Medicine

Vitamins are substances that your body needs to grow and develop normally. Vitamin A plays a role in your: Vision Bone growth Reproduction Cell functions Immune ...

Botox - National Library of Medicine

Botox is a drug made from a toxin produced by the bacterium Clostridium botulinum. It's the same toxin that causes a life-threatening type of food poisoning called botulism. ...

Adenoids - National Library of Medicine

What are adenoids? Adenoids are a patch of tissue that is high up in the throat, just behind the nose. They, along with the tonsils, are part of the lymphatic ...

Alcohol - National Library of Medicine

Many Americans drink alcohol at least occasionally. The Dietary Guidelines for Americans say that adults of legal drinking age should either not drink or ...

Allergy - National Library of Medicine

An allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more ...

Amblyopia - National Library of Medicine

Amblyopia, or "lazy eye," is the most common cause of visual impairment in children. It happens when an eye fails to work properly with the brain. The eye may look ...