Capsicum
"Capsicum, also known as red pepper or chili pepper, is an herb. The fruit of the capsicum plant is used to make medicine.
Capsicum is most commonly used for rheumatoid arthritis (RA), osteoarthritis, and other painful conditions. It is also used for digestion problems, conditions of the heart and blood vessels, and many other conditions, but there is no good scientific evidence for many of these uses.
A particular form of capsicum causes intense eye pain and other unpleasant effects when it comes in contact with the face. This form is used in self-defense pepper sprays."
