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Magically speaking, Saltpeter has a long, long, long history in hoodoo as an agent of magical protection in spritual baths and floor washes and as a shoe-sprinkle. Also, because it is an ingredient in Gunpowder, it is used in formulae which are hoped to produce quick (explosive) action, such as Block-Buster.
It is used preserve meat, temper steal, and to make gunpowder and fireworks. There is absolutely no scientific evidence that saltpeter reduces sex drive in men, or that it prevents men from getting erections, which was part of the colorful terms my fellow trainee provided in answer to my query. Just replace the word salt with soft and you will understand what I mean.