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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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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.