I was thinking to myself.... saltpeter, isn't that potassium nitrate?
a quick search on wiki turned this up:
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A popular misconception is that potassium nitrate is an antaphrodisiac and was added to food in all-male institutions. In fact potassium nitrate has no such effect in humans. [1]
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and then on "antaphrodisiac"
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Certain medications' side effects may be antaphroditic in nature, however, there are no substances that have safe antaphroditic effects without major side-effects.
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I can't think of any, myself. Cognitive training I guess.