Last verified: 17 days ago
Cayenne Pepper
Also known as: Capsicum annuum, capsaicin, red chili pepper, hot pepper
Evidence under review. — Not yet rated
Spice with capsaicin that shows weak evidence for fat burning; most solo studies show no effect.
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What it does
Cayenne pepper is a hot chili spice whose active compound is capsaicin. It is commonly added to supplements for its supposed thermogenic (heat-generating) and fat-burning properties. However, the...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose from provided studies
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Found in
zuPoo, ONE SOL Natural Fat Burner, Country Farms Apple Cider Vinegar Capsules and 1 more
What the Science Says
Cayenne pepper is a hot chili spice whose active compound is capsaicin. It is commonly added to supplements for its supposed thermogenic (heat-generating) and fat-burning properties. However, the available clinical evidence is mixed — one study found no increase in energy expenditure or fat oxidation from 500 mg of cayenne pepper at rest or during exercise, while another found modest trends when cayenne was part of a multi-ingredient blend. It also shows some prebiotic potential for gut bacteria in lab settings, and moderate antioxidant activity when added to cooked foods.
What It Doesn't Do
Won't melt fat on its own. Solo cayenne at typical supplement doses does not meaningfully boost metabolism or fat burning. Won't suppress hunger in any clinically meaningful way. Not a proven weight loss solution. No solid evidence it improves athletic performance by itself.
Evidence-Based Benefits
Adding cayenne pepper before cooking meat moderately reduces lipid oxidation during digestion.
Weak EvidenceEffective at: 0.5–1% by weight added to food
Supporting studies (click to view on PubMed):
Cayenne pepper shows prebiotic potential for Bifidobacteria and Lactobacilli in lab settings.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown from provided studies — no pharmacokinetic data reported in the provided papers
Red Flags to Watch For
- Almost always studied in multi-ingredient blends, making it impossible to isolate cayenne's individual effect
- The one solo clinical trial found zero thermogenic or fat-oxidation benefit at a typical supplement dose
- Commonly used in products making dramatic fat-loss claims that the evidence does not support
- Arsenic contamination has been detected in cayenne pepper samples, though levels in studied Thai herbs were within regulatory limits
- Gastrointestinal irritation is a known risk, especially at higher doses — not assessed in most supplement studies
Products Containing Cayenne Pepper
See how Cayenne Pepper is used in these analyzed products:
Frequently Asked Questions
What does Cayenne Pepper do?
Spice with capsaicin that shows weak evidence for fat burning; most solo studies show no effect.
What is the effective dose of Cayenne Pepper?
No established dose from provided studies
Is Cayenne Pepper safe?
Almost always studied in multi-ingredient blends, making it impossible to isolate cayenne's individual effect
What doesn't Cayenne Pepper do?
Won't melt fat on its own.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25