Capsaicin is the heat-producing substance in chili peppers, including cayenne. Human studies most clearly support topical capsaicin for some short-term pain uses; studies of oral capsaicin or red pepper for weight, cardiovascular markers, and exercise report small or mixed effects rather than a clear, broad health benefit.
Capsaicin does not have human evidence here for removing plaque from arteries. The 2026 cardiovascular review measured cholesterol, blood pressure, and blood-sugar-related markers—not plaque removal—and its small findings were not stable when individual studies were removed.
Quick facts: forms, study doses, and uses
| Question | What human studies used or examined |
|---|---|
| Forms | Topical ointment, cream, gel, oil, and solution; oral capsaicin analogues; red pepper or capsaicin supplements. |
| Topical concentration studied for osteoarthritis pain | 0.0125% to 5% topical capsaicin. |
| Study length | Exercise studies examined acute intake. Osteoarthritis follow-up reached up to 3 months. Cardiovascular subgroup findings considered interventions lasting 8 weeks or longer. |
| Main studied uses | Osteoarthritis pain, orofacial pain, cardiovascular risk factors, weight-related measures, and athletic performance. |
What do human studies show?
Topical capsaicin for osteoarthritis pain
A 2024 systematic review and meta-analysis of eight double-blind randomized trials, involving 498 people with osteoarthritis, found that topical capsaicin may reduce pain compared with placebo. The studies used concentrations from 0.0125% to 5% and followed people for up to three months. Burning at the application site was more common with capsaicin. The review rated the evidence low to very low certainty because the trials were small, short, and varied. Read the osteoarthritis pain review for the trial details.
This is a useful example of why a result from several trials can still be uncertain: study size, duration, and how closely the studies match each other all matter. ingredient evidence marketing claims explains how to separate an ingredient finding from a bigger marketing promise.
Capsaicin for mouth and facial pain
A 2026 systematic review and meta-analysis included nine human studies with 164 participants who had conditions such as burning mouth syndrome, temporomandibular disorders, trigeminal neuralgia, and neuropathic facial pain. In placebo-controlled comparisons, pain reduction did not reach statistical significance. Uncontrolled before-and-after studies showed a larger reduction, while mild, localized, self-limited side effects were more frequent than with control treatment. The orofacial pain review found the most consistent uncontrolled findings for burning mouth syndrome.
If you are looking for a cayenne mixture for neuropathy, this research does not provide a DIY recipe. MedlinePlus topical capsaicin guidance describes prepared topical forms for skin use and says not to put them on broken, damaged, infected, or rash-covered skin.
Cardiovascular markers and artery plaque
A 2026 systematic review and meta-analysis pooled 13 randomized controlled trials with 821 adults using red pepper, capsaicin, or related compounds. It found small reductions in total cholesterol and diastolic blood pressure, but those results depended on a single study and became non-significant when that study was excluded. There were no significant effects on LDL, HDL, triglycerides, systolic blood pressure, glucose, insulin, HOMA-IR, or HbA1c. The cardiovascular risk-factor review rated most evidence low to very low certainty.
It also does not make cayenne a replacement for prescribed cardiovascular medicine.
Weight-related measures
A 2023 systematic review and meta-analysis combined 15 randomized controlled trials with 762 people who were overweight or obese. Compared with control groups, capsaicin supplementation was associated with modest average reductions in body-mass index, body weight, and waist circumference: 0.25 kg/m², 0.51 kg, and 1.12 cm, respectively. The authors described the effects as rather modest. See the weight-loss trial review for the full results.
Exercise performance
A 2026 three-level meta-analysis included 21 randomized crossover trials of acute oral capsaicin analogues in healthy adults. Overall athletic performance improved by a small amount versus placebo. The clearer subgroup findings were for power and muscular endurance, not strength or aerobic capacity. The athletic-performance meta-analysis also reported heterogeneity, publication bias, and very low certainty of evidence.
What doses did researchers use?
Researchers used topical capsaicin concentrations from 0.0125% to 5% in the osteoarthritis trials. The exercise review evaluated acute oral capsaicin analogues, while the cardiovascular and weight reviews combined trials of capsaicin, red pepper, or related compounds. The summaries do not provide one comparable oral dose across all trials, so they do not support a single daily amount for you to take.
For context on how another ingredient page handles study dose versus a personal dose decision, see zinc benefits evidence.
Safety, side effects, and medicine interactions
MedlinePlus says topical capsaicin can cause burning, redness, itching, or irritation where it is applied. Severe burning, pain, swelling, blistering, eye irritation, coughing, sneezing, tearing, and throat or respiratory irritation can occur. Heat sources, including heating pads and electric blankets, should be kept away from treated skin, and dried residue should not be inhaled.
MedlinePlus advises telling a doctor or pharmacist about prescription medicines, nonprescription medicines, vitamins, supplements, and herbal products before using topical capsaicin. It does not name a specific medicine interaction in the page. The cardiovascular, weight, and exercise reviews in this page do not answer whether taking cayenne every day is safe for every person, and they do not report a liver outcome that answers whether capsaicin is hard on the liver.
Who should talk to a clinician first?
- Anyone with an allergy to capsaicin, chili peppers, or ingredients in a topical capsaicin product.
- Anyone who is pregnant, planning pregnancy, or breastfeeding.
- Anyone taking prescription or nonprescription medicines, vitamins, supplements, or herbal products.
- Anyone considering topical use on skin that is broken, damaged, cut, infected, or covered by a rash.
A clinician or pharmacist can help you match the exact product form to your medicines and situation without changing a prescribed medicine on your own.
What is still unknown?
The human evidence is weak or mixed outside the topical pain findings. The cardiovascular review found low-to-very-low certainty evidence and no reliable changes in many measured markers. The weight review found modest average changes, not a predictable individual outcome. The exercise review found a small acute effect with very low certainty. None of these studies answers whether hotter peppers offer greater health benefits, whether capsaicin removes artery plaque, what happens with daily cayenne use over the long term, or whether capsaicin affects the liver.
Turmeric is a separate ingredient topic from cayenne and capsaicin. For the questions about turmeric, including parasite claims, combinations, and safety, use the dedicated turmeric and curcumin evidence page rather than applying capsaicin findings to it.
How to read a label that lists cayenne or capsaicin
- Look for the form. A topical cream and an oral cayenne or pepper product are not interchangeable study formats.
- Look for the amount. Compare the label’s stated amount and form with the form actually used in the study you are considering.
- Check blends closely. If cayenne or capsaicin appears inside a proprietary blend, ask the manufacturer for the amount of that ingredient before trying to compare it with a study.
- Read skin-use directions carefully. For topical products, follow the package instructions and the precautions in the MedlinePlus guidance.
By ClinicalStudyConnect.com Research Desk
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.