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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.