This index brings together 586 poisons from across the natural and chemical world. The selection includes compounds found in plants, animals, minerals, and man-made sources.

Poisons are substances that cause harm or death when they enter a living organism, whether through ingestion, inhalation, or contact with skin. They range from potent neurotoxins found in tiny frogs to industrial chemicals used in manufacturing. Some poisons act within seconds, while others build up in the body over years before causing visible effects. Understanding these substances helps scientists develop antidotes, guides safety regulations, and informs forensic investigations.

Interesting and little-known facts about Poisons: – Botulinum toxin is the most potent poison known, with a lethal dose measured in nanograms. – Arsenic earned the nickname “inheritance powder” because it was untraceable for centuries. – Some poison dart frogs lose their toxicity when raised away from their natural diet. – Cyanide smells like bitter almonds, yet only about 40% of people can detect the odor. – The mandrake plant appears throughout centuries of folklore for its toxic, hallucinogenic roots. – Mercury poisoning was once common among hat makers, giving rise to the phrase “mad as a hatter.”

The alphabetical index below organizes every entry by name, listing its source, effects, antidote, and a Description for quick reference.