Cayenne

Capsicum annuum and small-fruited Capsicum frutescens · Solanaceae · dried ripe fruit

Also known as red pepper, chili pepper, bird pepper, Guinea pepper, African pepper, La Jiao (Chinese), Lal Mirch (Hindi)

Hot
Dry
Pungent
Circulatory stimulant
Diaphoretic
Carminative
Rubefacient
Counter-irritant

Educational content, not medical advice. Nothing on this page is a substitute for care from a qualified healthcare provider. Do not stop or change a prescribed medication based on anything you read here. Cayenne is a strong irritant to skin, eyes, and the digestive lining, and medicinal amounts can interact with medications and health conditions, so talk with your doctor or pharmacist before using it beyond food amounts.

About Cayenne

Cayenne is the dried ripe fruit of hot pepper plants in the genus Capsicum, in the nightshade family, Solanaceae. The name comes from the port of Cayenne in French Guiana. Most cayenne sold as a spice or herb is Capsicum annuum, a branching annual that grows 1 to 2 feet tall with white flowers and red, tapering pods. The European Pharmacopoeia and the EMA also accept the small-fruited varieties of Capsicum frutescens, a shrubby perennial with smaller, upright fruits.^1,6

Native range: tropical and subtropical America. King's records the genus as native to "the East and West Indies, and of most hot climates throughout the globe," with a good wild variety in Texas; the East Indian populations descend from plants carried out of the Americas by Spanish and Portuguese traders after 1492.¹
Where it grows now: every warm region on earth. Pharmaceutical supply for Europe comes mainly from tropical Africa and India.
Identifying the dried fruit: oblong-conical, 10 to 20 mm long in the small-fruited types, red and translucent, with flat yellowish seeds attached to a thick central membrane called the placenta. King's notes that powdered cayenne fades from bright red to brown or yellow in light and that insects will attack it.¹
Where the heat lives: the placenta. Arthur Meyer demonstrated in 1889 that the white inner membrane carries the capsaicin, not the seeds or the flesh, which is why removing ribs and seeds tames a pepper.¹
Growing conditions: full sun, warm soil, a long season. In cold-winter zones it is grown as an annual started indoors.

Cayenne, paprika, and chili powder

All three come from Capsicum annuum. Cayenne is a hot cultivar dried and ground on its own. Paprika is a mild cultivar with little capsaicin, and Commission E lists low-capsaicin paprika separately as an unapproved herb. Chili powder is a seasoning blend that usually contains cumin, garlic, and oregano along with ground chili. For medicinal use, plain cayenne powder or whole dried pods are what the sources on this page mean.

Traditional Use

The traditions below describe how practitioners have used cayenne. These are historical and clinical records, not instructions. None of this is medical advice.

Energetics

Cayenne is hot, dry, and pungent in every system that classifies it. Western herbalists call it a pure stimulant, a diaphoretic (a herb that promotes sweating), a carminative (a herb that relieves gas), and a rubefacient (a substance that reddens the skin by drawing blood to the surface).^1,4 The pattern it suits is cold, pale, sluggish, and depressed: cold hands and feet, weak pulse, poor appetite with scanty secretions, and the debility of old age. Felter's rule for who should avoid it is short: "it should be selected for atonic conditions and avoided where irritation or active inflammation is present."²

The Eclectics

King's American Dispensatory (1898) calls capsicum "a pure, energetic, permanent stimulant" and records its use in:¹

atonic dyspepsia and catarrhal gastritis, where it "stimulates the nerves of the stomach, promotes the secretion of the digestive juices, and assists peristaltic motion"
delirium tremens and the digestive collapse of chronic alcoholism, which King's calls its best use
low fevers and congestive chills with cold extremities, small weak pulse, and a dry harsh tongue
colds, catarrh, and hoarseness, as an infusion
chronic hemorrhoids from relaxation, combined with a quarter grain of aloes
"passive hemorrhages, especially uterine," and postpartum bleeding when combined with compound powder of ipecacuanha
externally: a gargle for ulcerated sore throat and relaxed uvula, concentrated tincture for chilblains and toothache, powder in the stockings for cold feet (a favorite of Professor Scudder), and plasters and liniments for rheumatic and neuralgic pain

One line from King's deserves attention because it cuts against the modern herbalist picture of cayenne as a whole-body circulation booster: "though a stimulant, the general circulation is but little increased by capsicum."¹ Felter's Eclectic Materia Medica (1922) disagrees, describing it as "a pure stimulant to the heart and circulation, giving increased force and slightly augmented frequency to the pulse."² Felter's three named uses were re-establishing suppressed secretions, the weak digestion of the aged, and acute alcoholism. He also preferred liquid preparations over powder for internal use "on account of the rectal discomfort occasioned by the latter."²

Dr. John R. Christopher and the American folk tradition

Dr. John R. Christopher (1909 to 1983), founder of the School of Natural Healing, made cayenne the center of his practice and wrote a book on it alone. His students quote him as saying that anyone who masters only one herb should master cayenne. He took a teaspoon of powder in warm water three times a day for decades and recommended working up to that dose from an eighth of a teaspoon, describing cayenne as food for the heart muscle and a regulator that "equalizes" circulation.^3,14 He used it internally for circulation, digestion, ulcers, and shock, and externally as a tincture, salve, and a hot bath with ginger for aches and influenza. Christopher also claimed to have stopped heart attacks and internal bleeding with cayenne tea. Those claims are historical, they were never tested, and a cardiac emergency requires emergency services. They are not repeated on this page as guidance.

European regulatory monographs

Germany's Commission E approved cayenne for external use only, for painful muscle spasms of the shoulder, arm, and spine, in adults and school-age children.⁵ The European Medicines Agency's 2015 monograph accepts capsicum extracts in plasters and creams as "well-established use" for the relief of muscle pain such as low back pain, in adults only, for up to three weeks.⁶ Neither body approved an internal use.

Modern clinical use

David Hoffmann, in Medical Herbalism, lists cayenne as a stimulant, carminative, tonic, sialagogue (a herb that increases saliva), rubefacient, and antiseptic, used for poor peripheral circulation, cold hands and feet, flatulent dyspepsia, and as a gargle for sore throat, and externally in liniments for muscle and joint pain.⁴ Contemporary herbalists also add a pinch to formulas as a "carrier," on the reasoning that it drives other herbs to the periphery. That practice is traditional; it has not been tested in a trial.

Constituents and What They Do

One family of compounds does nearly all the work in cayenne. The rest matter for color, nutrition, and shelf life.

Constituent	Amount and where it sits	What studies show
Capsaicinoids (capsaicin, dihydrocapsaicin, nordihydrocapsaicin, and minor relatives)	0.3 to more than 1 percent of the dried fruit by the EMA's figures; capsaicin makes up 63 to 77 percent of the total and dihydrocapsaicin 20 to 32 percent.⁷ Hoffmann gives up to 1.5 percent.⁴ Concentrated in the placenta. Nearly insoluble in water; dissolves in alcohol, fats, and oils.	The pungent principle and the medicine. Capsaicin binds TRPV1, a heat-sensing ion channel on pain-carrying nerve fibers, which is why it feels hot. Applied to skin repeatedly or at high concentration it "defunctionalizes" those fibers for weeks, reducing pain signaling; this is the basis of every approved topical use.¹⁰ Taken by mouth it raises gastric secretion and motility at small doses and irritates at large ones.²
Carotenoids (capsanthin, capsorubin, beta-carotene, lutein)	The red and orange pigments in the flesh. Fat-soluble.	Antioxidant in laboratory work; beta-carotene converts to vitamin A. No cayenne-specific human outcome data. Light degrades them, which is why old powder turns brown.^1,7
Ascorbic acid (vitamin C)	Present in fresh fruit at meaningful levels; much lower in dried powder.⁷	Nutritional. Fresh hot peppers are among the richer vegetable sources.
Fatty oil	Roughly 9 to 17 percent of the dried fruit, mostly in the seeds.	Carries the capsaicinoids in the oleoresin (the concentrated oil-and-resin extract) and gives infused oils and salves their potency.
Steroidal saponins (capsicidins)	Seeds and root.⁴	Laboratory antimicrobial activity reported. No clinical relevance established.
Volatile compounds	Trace. King's describes a non-acrid volatile fraction that gives cayenne its odor.¹	Aroma only. Cayenne has no meaningful essential oil, so "cayenne essential oil" products are oleoresin, not a distillate.

What the Research Shows

Almost all of the human evidence on cayenne concerns capsaicin applied to the skin for pain. There, the picture is consistent: low-concentration creams give modest relief to a minority of people with neuropathic or joint pain after weeks of use, and a prescription 8 percent patch does about the same with one application. Internal use has one small controlled trial (functional dyspepsia) and a very large observational cohort linking regular spicy food to lower mortality, which cannot prove cause. Nothing in the trial literature tests the traditional circulatory or "carrier" uses.

Low-concentration capsaicin cream for chronic pain

Mason et al., BMJ, 2004 · Systematic review of randomized trials · Capsaicin creams 0.025 and 0.075 percent, and a capsicum plaster

Design: Oxford pain research group pooled six double-blind placebo-controlled trials (656 people) in neuropathic pain and three (368 people) in musculoskeletal pain, all using creams applied 3 to 4 times daily.
Findings: for neuropathic pain, 0.075 percent cream gave about 50 percent pain reduction to roughly one extra person in six compared with placebo (number needed to treat 5.7) at 8 weeks. For musculoskeletal pain, 0.025 percent cream or plaster helped one extra person in eight (NNT 8.1) at 4 weeks. About a third of users had local burning or stinging that placebo users did not.⁸
Dose: 0.025 to 0.075 percent capsaicin, applied 3 to 4 times daily.
Limitations: the authors themselves rate the efficacy "moderate to poor." Blinding is imperfect because the cream burns and placebo does not. The trials used isolated capsaicin, not whole cayenne. No industry funding declared for the review; several underlying trials were manufacturer-funded.

Read the review

Single-application 8 percent capsaicin patch for neuropathic pain

Derry et al., Cochrane Database of Systematic Reviews, 2017 · Systematic review of 8 randomized trials · Isolated capsaicin, 8 percent patch

Design: 2,488 adults with postherpetic neuralgia, HIV neuropathy, or diabetic neuropathy, given one 30 to 60 minute application of the 8 percent patch or a 0.04 percent "active placebo" patch, followed 8 to 12 weeks.
Findings: about 10 percent more people reported themselves much or very much improved with the high-concentration patch, with numbers needed to treat of 8.8 at 8 weeks and 7.0 at 12 weeks for postherpetic neuralgia (moderate-quality evidence). One in three had transient pain at the application site.⁹
Dose: one application of 8 percent capsaicin, a concentration roughly 100 times a drugstore cream.
Limitations: a prescription drug product, not a herb, and not something to reproduce at home. The active placebo helps blinding but means the comparison understates the effect against no treatment. Two review authors declared consultancy income from companies including the patch's manufacturer; Cochrane itself takes no industry money.

Read the review

How topical capsaicin works: the substance P correction

Anand and Bley, British Journal of Anaesthesia, 2011 · Narrative review of laboratory and clinical mechanism studies · Isolated capsaicin

Design: a review of the experimental and clinical literature on what capsaicin does to skin nerve fibers, written by an Imperial College neurologist and a scientist at the company that developed the 8 percent patch.
Findings: the long-taught idea that capsaicin relieves pain by depleting substance P is "only a correlate" with "little, if any, causative role." Pain relief comes from defunctionalization: capsaicin opens the TRPV1 channel, calcium floods the nerve terminal, mitochondria fail, and the fiber ending retracts from the skin for weeks before regrowing. Capsaicin is nearly insoluble in water and barely reaches the bloodstream from skin, so the action is local.¹⁰
Dose: not applicable; mechanism review.
Limitations: co-author Bley was employed by NeurogesX, maker of Qutenza, and the paper was written to support that product. The mechanism itself is confirmed by independent laboratory work and is now the standard account.

Read the review

Red pepper powder for functional dyspepsia

Bortolotti et al., Alimentary Pharmacology and Therapeutics, 2002 · Human randomized double-blind trial · Whole red pepper powder in capsules

Design: 30 people in Bologna with functional dyspepsia (chronic indigestion with no ulcer or reflux disease found) took 2.5 g of red pepper powder daily in capsules before meals, or placebo, for 5 weeks, after a 2-week washout.
Findings: from the third week on, the pepper group's scores for overall symptoms, epigastric pain, fullness, and nausea were significantly lower than placebo. Symptom scores fell about 60 percent with pepper against under 30 percent with placebo. The authors attribute it to desensitization of the stomach's capsaicin-sensitive nerve fibers.¹¹
Dose: 2.5 g of powder daily, containing about 1.75 mg capsaicin.
Limitations: 15 people per group is small, and the trial has not been replicated at scale. People with reflux and irritable bowel were excluded, so the result does not extend to them. This is the only controlled trial of whole cayenne taken by mouth for a digestive complaint, and it supports the Eclectic use in atonic dyspepsia. University-funded.

Read the study

Spicy food and mortality in half a million adults

Lv et al., BMJ, 2015 · Prospective cohort study · Self-reported spicy food, mostly fresh and dried chili

Design: 487,375 adults in the China Kadoorie Biobank, aged 30 to 79 and free of cancer, heart disease, and stroke at enrollment, reported how often they ate spicy food and were followed a median of 7.2 years, during which 20,224 died.
Findings: compared with eating spicy food less than once a week, eating it 6 or 7 days a week was associated with a 14 percent lower risk of death after adjustment for age, sex, education, smoking, alcohol, activity, and diet. Associations held for deaths from cancer, ischemic heart disease, and respiratory disease, and were stronger in people who did not drink alcohol.¹²
Dose: not measured; frequency only.
Limitations: observational, so it shows association and not cause. Spicy-food eaters in China differ from others in region, income, and diet in ways adjustment cannot fully remove. Frequency was reported once at baseline. Funded by the Kadoorie Charitable Foundation, the Wellcome Trust, and Chinese government research grants.

Read the study

Dosing Perspectives

Not medical advice. The doses below are educational. They show how different herbalists, traditions, and regulators have approached cayenne so you can see where they agree and where they are far apart. They are not a recommendation for you. Work with your healthcare provider before using cayenne beyond food amounts, especially if you have a digestive condition, take blood-thinning or blood-pressure medication, or are pregnant.

Source	Preparation	Dose (as stated)	Use
King's American Dispensatory (1898)	Powdered capsicum; tincture (U.S.P.)	Powder 1 to 6 grains; tincture ½ to 1 fluid drachm. Tincture entry: 10 to 60 drops in water, 3, 4, or 5 times a day. Locke, for delirium tremens: 10 to 40 grains every 3 hours	Internal; tincture also as gargle, on chilblains, 1 or 2 drops on cotton for toothache
Felter, Eclectic Materia Medica (1922)	Specific Medicine Capsicum; tincture of capsicum; crude powder	Powder 1 to 2 grains; specific medicine 1/10 to 2 drops, "very largely diluted"; tincture 1/10 to 10 minims. "The dose of capsicum for most purposes need not be large, from the fraction of a drop of a good tincture to ten drops"	Internal; tincture painted on skin, in gargles, capsicum plaster
Dr. John R. Christopher, School of Natural Healing	Powder stirred into warm water ("cayenne tea"); tincture	1 teaspoon to 1 tablespoon in a cup of warm water; for daily use start at 1/8 teaspoon three times daily and work up to 1 teaspoon three times daily. Tincture: 2 ounces powder in 1 quart 90-proof alcohol, 14 days	Internal; tincture and salve external; teaspoon each cayenne and ginger in a hot bath
David Hoffmann, Medical Herbalism (2003)	Infusion; tincture 1:5 in 60 percent alcohol; topical cream	Infusion: 1 cup boiling water on ½ to 1 teaspoon cayenne, 10 minutes; 1 tablespoon of that infusion in hot water as needed. Tincture 0.25 to 1 ml three times daily. Topical: 0.025 to 0.075 percent capsaicin	Internal and external
German Commission E (1990)	Semi-solid preparations (creams, ointments) and plasters standardized to capsaicinoids	0.02 to 0.05 percent capsaicinoids; not more than 2 consecutive days on one site, then a 14-day interval	External only; painful muscle spasm of shoulder, arm, and spine
European Medicines Agency (2015)	Standardized soft extract in cream or plaster	Cream: 40 to 53 mg capsaicinoids per 100 g (0.04 to 0.053 percent), thin layer 2 to 4 times daily. Plaster: 11 mg (22 by 14 cm) or 4.8 mg (12 by 18 cm) capsaicinoids, one per day for 4 to 12 hours. Up to 3 weeks, then a break of at least 2 weeks. Adults only	External only; muscle pain such as low back pain
Bortolotti trial (2002)	Red pepper powder in capsules	2.5 g daily, divided before meals, for 5 weeks	Internal

The spread here is the widest on the site. Felter's ceiling of ten drops of tincture and Christopher's teaspoon of powder three times a day are separated by roughly a thousand-fold, and both men used cayenne daily on many patients. The difference is purpose and preparation. The Eclectics used concentrated liquid extracts in fractional doses to "re-establish repressed secretion" and considered the effect prompt and lasting.² Christopher treated cayenne as a food and dosed it like one, building tolerance over weeks.³ The one controlled trial of oral powder sits between them at 2.5 g a day, about half a teaspoon.¹¹ On external use, every source agrees on the concentration band, 0.02 to 0.075 percent, and the regulators add time limits.

Preparations by What You Want to Extract

Cayenne is a one-constituent herb for practical purposes, and that constituent hates water. If the extraction methods are new to you, start with my article on decoctions versus infusions.

Solubility of the constituents

Capsaicinoids: nearly insoluble in water, freely soluble in alcohol, fats, and fixed oils. King's lists the acridity as passing into "ether, spirit, vinegar, and fixed oils" and only "slightly" into water.¹ Heat-stable, so cooking does not destroy them.
Carotenoids: fat-soluble and light-sensitive. They come along in oil infusions and fade in a clear jar on a windowsill.
Vitamin C: water-soluble and lost in drying and heating. Fresh peppers only.

Preparations that fit the chemistry

Powder taken as is. Christopher's "tea" is powder stirred into warm water and drunk, sediment and all, which delivers the capsaicin because nothing is strained out.¹⁴ Capsules do the same more slowly, and Felter warned that powder can cause rectal burning on the way out.² The Bortolotti trial used powder in capsules.
Tincture. The preparation the Eclectics used almost exclusively and the one that keeps. Alcohol dissolves capsaicin well; King's concentrated tincture was 4 ounces of capsicum in 12 fluid ounces of rectified spirit for 7 days, and Christopher's was 2 ounces per quart of 90-proof for 14 days.^1,14 A 1:5 in 60 percent alcohol, per Hoffmann, is a workable modern strength.⁴ Dosed by the drop, diluted in water.
Infused oil and salve. Fat pulls the capsaicinoids and carotenoids together. This is the home version of the Commission E and EMA creams, with the caution that you cannot know your capsaicinoid percentage without testing, so start weak and patch-test.
Gargle. A few drops of tincture in warm water, or Felter's "capsicum with vinegar, and sometimes with salt," for a sluggish sore throat.² Spit, do not swallow the whole cup.
Plaster and liniment. King's capsicum plaster was oleoresin painted onto a resin plaster; the compound liniment paired the tincture with other rubefacients.¹⁵ Modern equivalents are the EMA-approved plasters. For a warming pairing at food strength, ginger and cayenne together is the classic.

Preparations to skip

Strained water infusion or decoction as the main preparation. Most of the capsaicin stays behind in the marc. Hoffmann's infusion works because it is used by the tablespoon as a strong stock, not as a strained cup of tea. Christopher went further and said decoction loses the medicine.¹⁴
Glycerites. Glycerin extracts capsaicin poorly. King's used glycerin only as a soothing vehicle mixed into the alcohol tincture for topical use.²
"Cayenne essential oil." There is no true distilled oil; products by that name are oleoresin, which Felter describes as "much more active" than the tincture and able to "destroy the epidermis."² Not a home ingredient.

Safety and Cautions

Not medical advice. Herbs contain active compounds that can interact with medications and health conditions. Cayenne's risks are mostly about irritation and dose: it is a food at a pinch and an irritant at a spoonful. No overdose has ever been reported to the EMA from topical products, and King's states that "there is no danger of giving an overdose" to a hardened drinker, while also listing vomiting, purging, and stomach inflammation as effects of large doses in everyone else.^1,6 Where Francis Brinker's Herbal Contraindications and Drug Interactions supplies an evidence grade (human study, animal, in vitro, empirical, or speculative), it is given in brackets so you can weigh each caution for yourself.¹⁶ Talk with your healthcare provider or pharmacist before using cayenne beyond food amounts if any of the cautions below apply to you.

Skin, eyes, lungs, and handling

Never on broken skin, wounds, or eczema. The EMA lists these as contraindications; Brinker adds that application to damaged skin can cause excessive irritation and an open sore [empirical]; Felter notes that the oleoresin "may destroy the epidermis."^2,6,16
Keep it away from eyes and mucous membranes [empirical]. Wash hands with soap after handling any preparation.^6,16
Do not inhale it. Capsaicin causes immediate narrowing of the airways when breathed in [human study], and Brinker flags that a single exposure may aggravate acute asthma [speculative, from intravenous animal work].¹⁶ Grinding dried pods and cooking over high heat both put capsaicin in the air; people with asthma should be careful in the kitchen, not only with the herb.
Expect burning the first days. Redness and warmth are the intended effect. In trials about one in three users had stinging, itching, or burning that placebo users did not; it is worst in week one. Stop if it becomes excessive.^6,8
No added heat. The EMA warns against heating pads, hot baths, sun, or heavy sweating over a treated area, and against other rubs or pain gels on the same site for up to 12 hours after a plaster comes off.⁶ Christopher's cayenne-and-ginger hot bath is a folk preparation that regulators would not approve; if you use it, go weak.
Allergy. Hypersensitivity to capsaicinoids or other pepper plants is a contraindication. Hives, blisters, and vesicles at the site are reported, frequency unknown; Brinker lists urticaria (hives) with allergic hypersensitivity and rare allergic reactions on sensitive skin [both empirical].^6,16

Digestive tract

Active inflammation. Felter's rule: use cayenne in atonic (sluggish) states and avoid it "where irritation or active inflammation is present." He also cautioned against long continuous use in chronic gastric catarrh "lest it increase the malady."²
Ulcers, reflux, and gastritis: three positions. Brinker says do not consume excessive amounts with stomach ulcers or stomach inflammation, and do not take it with excess acid or GERD [both empirical], because the fruit powder or extract increases gastric acid production [human studies] and can cause shedding of the stomach lining and bleeding [human studies].¹⁶ Satyanarayana's 2006 review reached the opposite conclusion from laboratory, animal, and population data: capsaicin inhibits acid, increases protective mucus and blood flow, and ulcers are less common where chili is eaten.¹³ Christopher used cayenne for ulcers on that reasoning decades earlier.³ Brinker's own adjunct notes suggest dose is the deciding variable: 20 g of powdered fruit (9.56 mg capsaicin) taken half an hour before aspirin reduced stomach lining damage in 18 people [human study], and in rats dilute capsaicin protected the stomach from aspirin and alcohol while 10 to 30 mg/kg made the damage worse [animal].¹⁶ Anyone with an active ulcer, gastritis, or reflux should decide this with their provider, not from this page.
Chronic irritable bowel. Brinker lists it as a contraindication because capsaicin irritates gut nerves and contracts intestinal muscle [in vitro, animal, and human studies].¹⁶ The Bortolotti dyspepsia trial excluded people with irritable bowel for the same reason.¹¹
Rectal burning. Felter preferred liquid preparations over powder for this reason, and hemorrhoid sufferers with active burning should skip powder.²
Large doses. Vomiting, purging, stomach pain, giddiness, and "a species of intoxication" per King's and Felter.^1,2

Bleeding and blood thinners

Oral cayenne has caused stomach lining bleeding in human studies, and Brinker attributes this in part to fibrinolytic activity of capsicum (breakdown of blood clots) [human studies] and to inhibition of platelet clumping by capsaicin [in vitro].¹⁶ No controlled trial has measured an interaction with warfarin, clopidogrel, or aspirin, and the mechanism data point in the direction of added bleeding risk at medicinal doses. King's records the opposite use, cayenne to arrest passive hemorrhage, which has no trial support either.¹ If you take an anticoagulant or antiplatelet drug, keep cayenne at food amounts unless your prescriber agrees otherwise. Topical capsaicin barely enters the bloodstream and the EMA reports no known drug interactions from skin use.^6,10

Medications

ACE inhibitors. Capsaicin cream applied to the skin set off coughing in a person taking an ACE inhibitor [human case report], the class of blood-pressure drugs already known for causing cough.¹⁶
Antacids. Cayenne works against them by raising acid production and irritating the lining [empirical; human studies].¹⁶
Theophylline. Capsicum fruit taken 11 hours before or with theophylline increased its absorption and probably slowed its clearance [rabbits]. Theophylline has a narrow safe range, so ask a pharmacist before medicinal cayenne.¹⁶
Sedatives and acetaminophen. Acute capsicum extract lengthened barbiturate sleeping time while chronic use shortened it, and capsaicin increased acetaminophen absorption [rats]; capsaicin inhibited liver breakdown of ethylmorphine [in vitro].¹⁶ Animal and test-tube findings only, listed so you know they exist.
Blood pressure and heart medication. Cayenne is a circulatory stimulant by tradition and its effect on blood pressure has not been tested in a controlled trial. People on antihypertensives or with a heart condition should not add medicinal doses without their prescriber.
Oral arthritis drugs, a positive note. In a 4-week randomized double-blind trial, 0.025 percent capsaicin cream on the knees of 36 people with osteoarthritis and 16 with rheumatoid arthritis, most of whom were taking oral arthritis medication, produced significantly more pain relief than the oral drugs alone; two people withdrew because of the burning [human study].¹⁶

Pregnancy, nursing, and children

Pregnancy and nursing. Food amounts are not flagged by any source on this page. For medicinal amounts the EMA reports no human data, notes that capsaicin crosses the placenta and may pass into milk, and cites animal reproductive toxicity at high injected doses well above anything a cream delivers; its position is use only after a careful risk-benefit assessment.⁶ The Eclectics used capsicum during postpartum hemorrhage, which is a historical note and not a plan.¹
Children. The EMA does not recommend topical capsicum under 18 for lack of data; Commission E allowed it in school-age children.^5,6 Keep powder and tincture out of reach; a child's eyes and mouth react far worse than an adult's.

Energetic caution

Practitioners who apply energetic categories keep cayenne away from hot, dry, irritated constitutions: people who run warm, flush easily, have acid reflux or an inflamed gut, or are already agitated. The pattern matches Felter's "irritation or active inflammation" warning and Brinker's GERD and gastritis entries, stated in different words.^2,16

Frequently Asked Questions

Is cayenne pepper good for you?

In food amounts it is a nutritious spice, and a large Chinese cohort found people who ate spicy food most days had a 14 percent lower death rate over 7 years, an association that does not prove cause. As a medicine, the strongest evidence is for capsaicin creams and patches applied to the skin for nerve and joint pain, where a minority of users get meaningful relief. Traditional use centers on cold, sluggish digestion and circulation.

Does cayenne pepper thin the blood?

It can affect clotting. Human studies show oral cayenne can cause bleeding from the stomach lining, and capsicum has clot-dissolving activity in human studies and platelet-inhibiting activity in the test tube. No trial has measured what that does to someone on warfarin or aspirin. Traditional herbalists claimed the opposite, using cayenne to stop passive bleeding, with no trial support. If you take a blood thinner, stay at food amounts unless your prescriber says otherwise.

Does cayenne raise or lower blood pressure?

No controlled trial has measured it. King's said the general circulation is "but little increased" by capsicum; Felter reported a stronger, slightly faster pulse; Christopher believed it "equalized" pressure. Anyone with high or low blood pressure should treat those as three opinions and talk with their provider.

Is cayenne bad for ulcers?

Sources disagree, and dose appears to be the reason. Brinker's reference lists ulcers, gastritis, and reflux as reasons to avoid excessive amounts because the powder raises acid production in human studies. A 2006 review found capsaicin protects the stomach lining and that ulcers are less common in chili-eating populations. In the studies Brinker cites, low doses protected the stomach from aspirin and alcohol and high doses made the damage worse. People with an active ulcer or reflux should decide with their doctor.

How does capsaicin cream work?

Capsaicin opens a heat-sensing channel called TRPV1 on pain-carrying nerve fibers in the skin. With repeated or high-concentration exposure those fiber endings shut down and pull back from the skin for weeks, so they stop sending pain signals, then regrow. The older explanation, that capsaicin uses up "substance P," describes a side effect rather than the cause. Touch and pressure are unaffected because those sensations travel on fibers that do not carry TRPV1.

What is the difference between cayenne and black pepper?

Different plants and different chemistry. Cayenne is a nightshade fruit whose heat comes from capsaicin. Black pepper is the dried berry of a tropical vine whose heat comes from piperine, and it is used mainly for digestion and to increase absorption of other herbs. They share warming energetics and little else.

How hot is cayenne?

Typically 30,000 to 50,000 Scoville heat units, about ten times a jalapeño and a fraction of a habanero. Medicinal cayenne is graded by capsaicinoid content instead; the European Pharmacopoeia requires at least 0.4 percent.

Sources

Felter HW, Lloyd JU. Capsicum (U.S.P.). King's American Dispensatory, 1898. Public domain, hosted at Henriette's Herbal.
Felter HW. Capsicum. The Eclectic Materia Medica, Pharmacology and Therapeutics, 1922. Public domain, hosted at Henriette's Herbal.
Christopher JR. School of Natural Healing. Christopher Publications, 1976. Cayenne dosing and uses as summarized by the School of Natural Healing: Herbal Legacy, Cayenne and Cayenne, 100 Herb Syllabus. Herbal Legacy is run by the Christopher family's school and sells Christopher-formula products; treat its claims as the tradition's own account.
Hoffmann D. Medical Herbalism: The Science and Practice of Herbal Medicine. Healing Arts Press, 2003 (affiliate link). Capsicum entry. .
German Commission E monograph, Capsici fructus (Cayenne pepper), 1990. In: Blumenthal M, ed. The Complete German Commission E Monographs. American Botanical Council, 1998. ABC Expanded Commission E, Cayenne pepper. ABC is a nonprofit funded in part by industry membership.
European Medicines Agency, Committee on Herbal Medicinal Products. European Union herbal monograph on Capsicum annuum L. var. minimum (Miller) Heiser and small fruited varieties of Capsicum frutescens L., fructus. EMA/HMPC/674139/2013, adopted 5 May 2015.
European Medicines Agency, Committee on Herbal Medicinal Products. Assessment report on Capsicum annuum L. var. minimum (Miller) Heiser and small fruited varieties of Capsicum frutescens L., fructus. EMA/HMPC/674138/2013, 2015. Source of constituent percentages.
Mason L, Moore RA, Derry S, Edwards JE, McQuay HJ. Systematic review of topical capsaicin for the treatment of chronic pain. BMJ. 2004;328(7446):991. DOI: 10.1136/bmj.38042.506748.EE.
Derry S, Rice ASC, Cole P, Tan T, Moore RA. Topical capsaicin (high concentration) for chronic neuropathic pain in adults. Cochrane Database of Systematic Reviews. 2017;(1):CD007393. DOI: 10.1002/14651858.CD007393.pub4. Authors Rice and Cole declared consultancy or speaker payments from companies including the 8 percent patch's manufacturer.
Anand P, Bley K. Topical capsaicin for pain management: therapeutic potential and mechanisms of action of the new high-concentration capsaicin 8% patch. British Journal of Anaesthesia. 2011;107(4):490-502. DOI: 10.1093/bja/aer260. Co-author Bley was employed by NeurogesX, the patch's developer.
Bortolotti M, Coccia G, Grossi G, Miglioli M. The treatment of functional dyspepsia with red pepper. Alimentary Pharmacology and Therapeutics. 2002;16(6):1075-1082. DOI: 10.1046/j.1365-2036.2002.01280.x. University of Bologna.
Lv J, Qi L, Yu C, et al. Consumption of spicy foods and total and cause specific mortality: population based cohort study. BMJ. 2015;351:h3942. DOI: 10.1136/bmj.h3942. Funded by the Kadoorie Charitable Foundation, Wellcome Trust, and Chinese government grants.
Satyanarayana MN. Capsaicin and gastric ulcers. Critical Reviews in Food Science and Nutrition. 2006;46(4):275-328. DOI: 10.1080/1040-830491379236. Central Food Technological Research Institute, Mysore, India.
School of Natural Healing. Cayenne: Cultivation and Usage. Herbal Legacy, 2004. Source of Christopher's tea, tincture, and bath preparations. Same disclosure as source 3.
Felter HW, Lloyd JU. Tinctura Capsici (U.S.P.), Tincture of Capsicum, and Emplastrum Capsici (U.S.P.), Capsicum Plaster. King's American Dispensatory, 1898. Public domain, hosted at Henriette's Herbal.
Brinker F. Cayenne, Capsicum frutescens fruit. In: Herbal Contraindications and Drug Interactions, 4th edition. Eclectic Medical Publications, 2010:90-92. Evidence grades in brackets throughout the Safety section are Brinker's.

This monograph is updated as new research and sources become available.

Ivy Ham

I'm Ivy Ham, a clinical herbalist dedicated to blending traditional healing wisdom with modern science, and revealing how nature's remedies can enhance everyday wellness. Through my blog, I share insights on herbal solutions, nutrition, and holistic practices to guide you toward a more balanced, vibrant life.

Certified clinical herbalist · Missoula, Montana · Read more about Ivy

Cayenne