Botulinum toxin, the most lethal substance known to science has an LD50 (lethal dose 50) of merely 1 nanogram per kilogram of body weight.

Despite being an essential part of daily life, water can become toxic when consumed excessively or inappropriately.

“All things are poison, and nothing is without poison; only the dose makes a thing not a poison.” These words laid the groundwork for modern toxicology.