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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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On average, the stomach produces 2 L of hydrochloric acid per 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.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.