Pepper stand at Central Market in Houston, Texas, showing its peppers ranked on the Scoville scaleThe ghost pepper of Northeast India is considered to be a "very hot" pepper, at about 1 million SHU.[1]The Naga Morich, with around 1 million SHU,[2] is primarily found in Bangladesh.
The Scoville scale is a measurement of pungency (spiciness or "heat") of chili peppers and other substances. It is recorded in Scoville heat units (SHU). It is based on the amount of capsaicinoids (chemical compounds that are heat components) in the substance. Capsaicin is the main capsaicinoid that is measured.[3]
The scale is named after its creator, American pharmacist Wilbur Scoville.[3][4] The Scoville organoleptic test is a subjective assessment derived from the capsaicinoid sensitivity by people experienced with eating hot chilis.[3]
An alternative method, high-performance liquid chromatography, can be used to quantify the capsaicinoid content as an sign of how pungent something is.[3][5]