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Parts used and where grown
Originally from South America, the cayenne plant is now used worldwide as a food and spice. Cayenne is very closely related to bell peppers, jalapeños, paprika, and other similar peppers. The fruit is used medicinally.

Active constituents
Cayenne contains a resinous and pungent substance known as capsaicin. Topical application of capsaicin relieves pain and itching by acting on sensory nerves. Capsaicin temporarily depletes “substance P,” a chemical in nerves that transmits pain sensations. Without substance P, pain signals can no longer be sent. The effect is temporary. Numerous double-blind trials have proven topically applied capsaicin creams are helpful for a range of conditions, including nerve pain in diabetes (diabetic neuropathy), psoriasis, body tenderness due to fibromyalgia, nerve pain after shingles, osteoarthritis pain, and rheumatoid arthritis pain.

With the aid of a healthcare professional, capsaicin administered via the nose may also be a potentially useful therapy for cluster headaches. This is supported by a double-blind trial.

Modest reductions in appetite have been found in healthy Japanese women and white men when they consumed 10 grams of cayenne pepper along with meals in a double-blind trial. A similar trial found that cayenne could increase metabolism of dietary fats in Japanese women. These trials suggest cayenne may help in the treatment of obesity.

In a double-blind study of people with dyspepsia (heartburn), supplementation with 833 mg of cayenne powder in capsules, three times per day before meals, reduced heartburn symptoms by 48%, compared with a placebo. However, 2 of 15 individuals receiving cayenne discontinued it because of abdominal pain.

How much is usually taken?
Topical creams containing 0.025 to 75% capsaicin are generally used. People often apply the cream to the affected area three or four times per day. A burning sensation may occur the first several times the cream is applied. However, this should gradually decrease with each use. The hands must be carefully and thoroughly washed after use, or gloves should be worn, to prevent the cream from accidentally reaching the eyes, nose, or mouth, which would cause a burning sensation. Do not apply the cream to areas of broken skin. For internal use, cayenne tincture (0.3 to 1 ml) can be taken three times per day. An infusion can be made by pouring 1 cup of boiling water onto 1/2 to 1 teaspoon of cayenne powder and let steep for ten minutes. A teaspoon of this infusion can be mixed with water and taken three to four times daily. In the treatment of heartburn, researchers have used 833 mg of cayenne powder in capsule form, taken three times per day before meals.

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