Cayenne Pepper (Capsaicin) (Capsicum annuum and related species): Uses, Evidence and Safety

Cayenne pepper and capsaicin: what reviews found for skin patches and creams, what the EU says about muscle-pain products, and cautions for eyes, broken skin, medicines and pregnancy.

Content last updated October 23, 2026. This page has not been medically reviewed.

Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.

Safety first: capsaicin burns. The EU herbal monograph (EMA, 2015) says capsaicin products must not be used on broken skin, wounds or eczema, must not be applied near the eyes or to mucous membranes, and should not be combined with extra heat such as a heating pad or warm water. [1] It also says hands should be washed with soap and water after handling the product. [1] Allergy to capsaicin-containing plants such as chili is a listed contraindication. [1] If a product gets into the eyes or causes severe pain, swelling or breathing trouble, get medical help; in the US, Poison Help is 1-800-222-1222 and emergencies are 911.

What cayenne and capsaicin are

Cayenne is the dried hot fruit of Capsicum annuum L. or Capsicum frutescens L., both accepted names in the family Solanaceae. [2][3] The EU monograph covers the fruit of C. annuum var. minimum and small-fruited C. frutescens. [1] Capsaicin is the main pungent compound. [1] Memorial Sloan Kettering (MSK, US) says cayenne supplements come as capsules, powders and liquid extracts, and that supplements are stronger than the herb used in cooking. [4] For cayenne as food, see black pepper, cayenne and capsaicin foods.

Traditional use

This is tradition, not proof. MSK says cayenne is used in traditional medicine for digestion and blood circulation, as a gargle for laryngitis, and by mouth as a stomach stimulant. [4]

What research shows

Capsaicin is studied mostly as a skin treatment for pain. Strong and weak products behave very differently.

Use and form	What the source found	Strength of evidence	Who and what was studied
Chronic nerve pain (high-concentration 8% skin patch, applied under controlled conditions)	A Cochrane review (2017) of 8 studies and 2,488 people found about 10% more people with postherpetic neuralgia much or very much improved than with a low-strength comparison patch. The authors described the evidence as moderate or very low quality and the effects as similar to other chronic pain therapies. [5]	Promising but limited	Adults with postherpetic neuralgia, HIV neuropathy or diabetic neuropathy; prescription patch
Chronic nerve pain (low-concentration cream, under 1%)	Cochrane (2012) found insufficient data to judge efficacy, and said the information suggests no meaningful effect beyond placebo cream. Skin irritation was common. [6]	Insufficient evidence	Six studies, 389 adults; 0.075% cream
Muscle pain such as low back pain	The EU regulator (HMPC, 2015) classed medicated plasters and semi-solid products with defined capsaicinoid content as well-established use for relief of muscle pain. [1] Its report said trials indicate "some efficacy" in muscle pain. [7]	Well-established use per the EU regulator; we did not review the trials ourselves	Adults; defined plasters or creams
Other pain, herbal remedies in general	A Cochrane overview (2017) rated evidence for herbal remedies for any condition as very low quality and typically limited to single studies. [8]	Insufficient evidence	Adults; topical products
Weight, blood pressure, digestion by mouth	MSK says thermogenic and appetite effects of capsaicin were small, and that a systematic review found no impact on blood pressure or heart rate. [4] Proper evidence not found in the sources we read for cayenne capsules improving digestion or circulation.	Insufficient evidence	Mostly capsaicin or capsinoids rather than cayenne capsules

Forms and why the form matters

A prescription 8% patch contains a capsaicin concentration about 100 times greater than conventional creams. [5] It causes intense burning, so it is applied under controlled conditions, often after local anesthetic. [5] Results for one cannot be applied to an over-the-counter cream, a plaster, a cayenne capsule or the hot sauce on a plate. The EU monograph quotes semi-solid products corresponding to 40-53 mg capsaicinoids per 100 g, used 2-4 times a day for adults, and says continued use should not exceed 3 weeks, followed by a break of at least 2 weeks. [1] That is a regulator's description, not advice for a person. A pharmacist can say what suits a particular person.

Safety

Burning and irritation: redness and a sensation of warmth are part of the normal action of capsaicin products, but hives, blisters and allergic reactions can occur and call for stopping at once. [1] Do not scratch the application site. [1]
By mouth: MSK lists sweating, eye or nose irritation, stomach irritation and stomach pain; it reports gastric cell exfoliation and bleeding in healthy volunteers who ate dietary capsicum. [4]
Medicines: MSK says capsaicin may affect blood pressure medicines or increase the cough linked to ACE inhibitors, and that people who have had a transplant should avoid concurrent capsaicin with cyclosporin. [4] It lists animal findings for antiplatelet, theophylline and liver-enzyme (CYP3A, P-gp) effects, with clinical relevance not yet determined. [4] The EU monograph says no interaction studies were performed and that capsaicin products should not be applied with other topical products at the same site. [1] See how interactions work and supplements and blood-pressure medicines.
Heart and blood pressure: MSK advises talking to a provider before using cayenne if you have high blood pressure or heart conditions. [4]
Pregnancy and breastfeeding: the EU monograph says there are no data in pregnant women, that capsaicin crosses the placenta and may pass into breast milk, and that skin products should be used only after a careful risk-benefit assessment. [1] MSK advises avoiding cayenne in pregnancy and breastfeeding, citing dermatitis in nursing infants. [4] See pregnancy and breastfeeding.
Children: the EU monograph does not recommend skin products under 18 years. [1]
Allergy: MSK reports anaphylaxis in one man with asthma after a meal with a chili pepper. [4]
Liver, kidney, surgery: not described in the sources we read. Tell the surgical team about any capsaicin or cayenne product; see supplements before surgery.

Quality

Strength and content vary by product; see herb quality and labels. The EU regulator's note that capsaicinoid content should be defined is one reason labels matter. [7]

Ginger, black pepper, herbs for joint pain and arthritis.

Frequently asked questions

Does capsaicin cream help pain?

Low-strength creams were not shown to work better than placebo creams for nerve pain in a Cochrane review (2012). [6] The EU regulator accepts defined capsaicin products for muscle pain. [1]

Is cayenne pepper in capsules proven for weight loss or digestion?

MSK says capsaicin effects on appetite and heat production were small. Proper evidence not found for digestion benefits of cayenne capsules in the sources we read. [4]

Can I use capsaicin on broken skin or near my eyes?

No. The EU monograph lists broken skin, wounds and eczema as contraindications and says to avoid the eyes and mucous membranes. [1]

Does cayenne interact with medicines?

MSK lists possible effects with blood pressure medicines, ACE inhibitors (cough) and cyclosporin. Ask a pharmacist. [4]

Is cayenne safe while breastfeeding?

MSK advises avoiding cayenne while breastfeeding, citing dermatitis in nursing infants. [4]

References

Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.