Cayenne Pepper Benefits: What Capsaicin Research Shows, Plus Side Effects

Cayenne pepper benefits mostly come down to capsaicin, the compound that makes chili peppers hot. Studies suggest capsaicin and related compounds slightly raise the calories your body uses, by about 34 to 59 a day in two pooled analyses, and may trim how much people eat at a meal. Those effects are small, the studies are short, and there is no good evidence that cayenne or a capsaicin supplement causes meaningful weight loss on its own. As a spice, cayenne is an ordinary food; concentrated capsules can upset the stomach and may interact with some medicines. Here is what the research shows, what Capsimax is, and why creams and patches are a different story.

Peptide Labs sells supplements that contain cayenne extract, but this article does not recommend any of them. It is general information, not medical advice.

What is cayenne pepper?

Cayenne is a hot chili pepper from the Capsicum genus; Memorial Sloan Kettering Cancer Center lists Capsicum frutescens and Capsicum annuum as its botanical names. Its heat comes from a family of compounds called capsaicinoids. The NIH Office of Dietary Supplements (ODS) says capsaicin is the most abundant and most studied of them.

Capsaicin activates TRPV1, a receptor on nerve endings that senses heat and pain. That is why it burns in the mouth, and why the same molecule appears in pain-relief creams. Capsinoids such as capsiate are close relatives found in a mild pepper variety called CH-19 Sweet. A 2012 Purdue University review explains that capsiate activates TRPV1 in the gut but not in the mouth, so it delivers little heat. Many studies test capsaicin and capsinoids together.

Cayenne pepper benefits: what the research shows

Metabolism and energy use

The 2012 Purdue review, which included meta-analyses, concluded that capsaicin and capsiate both raise energy expenditure and fat use, especially at high intakes, adding that “the magnitude of these effects is small.” A 2018 meta-analysis of 9 studies estimated about 59 extra calories a day. Notably, studies where participants had an average body mass index below 25 found no effect on energy expenditure. A 2021 meta-analysis of 13 placebo-controlled studies put the rise in resting metabolic rate at about 34 calories a day and called for higher-quality research. Our guide on how to boost metabolism compares this with caffeine, protein and exercise.

Appetite and calorie intake

A 2014 meta-analysis screened 74 trials and pooled 8 of them, with 191 participants. Taking capsaicinoids before a meal reduced the calories eaten at that meal by about 74, but results varied a lot between studies, and the ODS points out that body weight was not measured. The ODS also notes research suggesting capsaicin may make people feel full partly by causing stomach discomfort, such as burning, nausea and bloating, rather than through fullness hormones.

Weight

The longest trial in the ODS review followed 77 adults with overweight for 12 weeks. They took one of two amounts of capsaicinoids from Capsimax or a cornstarch placebo. Supplementation did not significantly change body composition measured by DEXA scan. People in the higher-amount group reported eating about 250 fewer calories a day than the placebo group by week 12, but intake was self-reported. Nine of the 39 people first enrolled in that group reported stomach or bowel distress, and their blood insulin rose while HDL (“good”) cholesterol fell. The ODS sums up the evidence this way: capsaicinoids might reduce calorie intake but showed no effect on body weight.

Capsaicin supplement options and Capsimax

A capsaicin supplement may contain ground cayenne, a standardized pepper extract, or a branded ingredient. Capsimax is a capsicum extract from OmniActive Health Technologies, described by company scientists as an encapsulated extract in beadlet form. Most published Capsimax research has industry ties:

• 2010, University of Memphis: 20 adults took a single serving or placebo in a crossover design. Blood free fatty acids and glycerol rose more than with placebo at some time points, with no difference in heart rate, blood pressure, adrenaline or noradrenaline.
• 2016 tolerability pilot: an open-label study in 12 women with overweight, written by OmniActive employees, reported no significant serious adverse events and called for longer studies.
• 2018 re-analysis: a post hoc look at the 12-week trial, funded by OmniActive with a company employee as co-author, found smaller fat-mass changes with the higher amount after statistical adjustment. The authors called it exploratory.

Several formulas we carry list Capsimax among many ingredients. Jacked Factory Burn-XT pairs it with caffeine, green tea extract and acetyl-L-carnitine. Sculpt Nation Burn lists it alongside two caffeine sources, chromium and other botanicals, and its label says not to combine it with other caffeine. Physician’s Choice Thin 30 combines Capsimax cayenne extract, which the label lists as 2% capsaicinoids, with probiotics, prebiotic fiber and a green tea extract the brand describes as caffeine free. Because these are blends, no effect can be credited to cayenne alone. Our review of whether fat burners work covers the other ingredients.

Topical capsaicin is a different product

Capsaicin creams and patches are regulated as drugs, not supplements. The FDA’s over-the-counter monograph for external pain relievers lists capsaicin as a counterirritant ingredient. In 2012 the FDA warned that over-the-counter muscle and joint products containing menthol, methyl salicylate or capsaicin had been linked to rare first- to third-degree chemical burns, with 43 cases reported between 1969 and 2011.

Qutenza is a prescription capsaicin patch first approved in 2009. Its label covers nerve pain after shingles and nerve pain from diabetic neuropathy of the feet in adults, and says only physicians or healthcare professionals may apply it. The label warns of substantial pain during application, temporary rises in blood pressure and severe burns. Results from skin products say nothing about capsules you swallow.

Side effects, heartburn and drug interactions

Cayenne used in cooking is a normal food. Concentrated products are another matter: the ODS lists stomach pain, burning sensations, nausea and bloating, and Memorial Sloan Kettering adds sweating and stomach irritation. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) lists spicy foods, along with coffee and other caffeine sources, among foods that may make acid reflux worse. Memorial Sloan Kettering flags these possible interactions:

• Blood thinners and antiplatelet drugs: capsaicin has antiplatelet effects.
• Blood pressure medicines: capsaicin may affect how they work, and ACE inhibitors have been linked to more coughing.
• Theophylline: capsaicin may increase how much is absorbed.
• Cyclosporine and other drugs: capsaicin may change the absorption or breakdown of medicines handled by the CYP3A enzyme or the P-gp transporter.

Memorial Sloan Kettering also advises caution during pregnancy and breastfeeding, for people with high blood pressure or heart conditions, and for transplant patients. Many cayenne formulas also contain stimulants, so check the full label and our guide to daily caffeine limits. Stop and seek medical care for severe stomach pain, chest pain or a racing heartbeat.

Frequently Asked Questions

Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Last reviewed September 2026.

Related guides: Do Fat Burners Work? Thermogenic Ingredients, Evidence and Risks, How to Boost Metabolism: What Really Changes the Calories You Burn, How Much Caffeine Is Too Much? Daily Limits, Overdose Signs and Label Math, Beetroot Powder Benefits: Nitric Oxide, Blood Pressure and Exercise Evidence.