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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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Thyroid conditions may make getting pregnant impossible.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.