What is capsaicin?

Capsaicin is an analgesic--a pain reliever--derived from hot chili peppers. It is commonly used to treat pain from osteoarthritis and neuralgia (severe nerve pain). Oddly, it is considered an irritant--it is what gives hot chili peppers their hotness. However, with repeated application it numbs the pain receptors in the area where it is applied.

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