There have been rumors for decades about the use of potassium nitrate (saltpetre) as a sexual desire inhibitor.
There are two primary problems with this theory. First (and most importantly) humans have been using it as a food preservative for centuries. If it really worked in such a way, we would expect to see a decrease in reproduction rates amongst the populations that ate such food (including corned beef and salted pork products such as ham), and that does not seem to have happened.
Second, potassium nitrate has been used to decrease blood pressure, and it apparently does so as a side effect of the nitrate group. Nitroglycerin is used for this express purpose in emergency medicine settings (sublingual nitroglycerin will, among other things, dilate coronary arteries possibly temporarily staving off the damage done by one partially blocked by atherosclerotic plaques). One of the physiological effects of excess NO (Nitrous Oxide, one of the end products of nitrate ingestion) is to also increase blood flow to the male genitalia, which would actually be the opposite effect intended.
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