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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

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