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Potassium nitrate is a compound of potassium with the molecular formula KNO3. This colourless chemical compound is found pure in nature as the mineral saltpeter, or nitre. Potassium nitrate is a crystalline salt that resembles table salt. It is used as a diuretic. People have been using potassium nitrate as a cure-all for everything from stomach ailments to arthritis. Potassium nitrate has been controversially ascribed with anti-aphrodisiac effects and is supposed to inhibit erections in men.