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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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Cyanide works by making the human body unable to use oxygen.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.