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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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D

Vitamin D - National Library of Medicine

Vitamins are substances that your body needs to grow and develop normally. Vitamin D helps your body absorb calcium. Calcium is one of the main building blocks ...

Hepatitis - National Library of Medicine

... of several viruses -- hepatitis viruses A, B, C, D, and E. In the United States, A, B, ... or shellfish. Hepatitis B, hepatitis C, and hepatitis D spread through contact with the blood of someone ...

Calcium - National Library of Medicine

You have more calcium in your body than any other mineral. Calcium has many important jobs. The body stores more than 99% of its calcium in the bones and ...

Abortion - National Library of Medicine

An abortion is a procedure to end a pregnancy. It uses medicine or surgery to remove the embryo or fetus and placenta from the uterus. The procedure is ...

Cancer - National Library of Medicine

Cancer begins in your cells, which are the building blocks of your body. Normally, your body forms new cells as you need them, replacing old cells that die. ...