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Cyanide Salts (Oral) Very Low Dose: The estimated lethal oral dose is 1-3 mg/kg of body weight. Small Amount: For an average adult, this is just 70-210 milligrams, roughly the size of a few grains of rice. C. Castor Beans (For Comparison) This level of toxicity for cyanide is far more immediate and universally lethal than agents like ricin from castor beans, where multiple beans are typically needed for fatality, and the onset is slower.