How much arsenic does it take to kill you?

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Exposure. The lethal dose of arsenic in humans is 2-20 mg/kg, or 140 to 1400 mg for an average-sized adult. A 140-mg potentially lethal dose is the same as 0. 145 grams. Less than 1/8 teaspoon can be fatal to a healthy adult, while even less could kill a child, an adult with impaired health, or an elderly person.
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