most toxic chemical known to man
Infection with the bacterium causes the disease botulism. The toxin is also used commercially in medicine, cosmetics, and research. Botulinum is the most acutely lethal toxin known, with an estimated human median lethal dose (LD50) of 1.3â2.1 ng/kg intravenously or intramuscularly and 10â13 ng/kg when inhaled.