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Green coffee bean extract is made from unroasted coffee beans, which hold far more chlorogenic acid than roasted ones. It became famous in 2012 after a television segment called it a miracle, but the small study behind the excitement was retracted in 2014 and the ingredient’s maker settled Federal Trade Commission (FTC) charges over it. Pooled trials since then suggest green coffee bean extract weight loss effects are small, about one to two and a half kilograms on average, and the NIH rates the trials as poor quality. Unless it is decaffeinated, the extract also contains caffeine, and labels often do not say how much. Here is what the research shows and how to read a label that lists it.
Peptide Labs sells supplements that contain green coffee bean extract, but this article does not recommend any of them. It is general information, not medical advice.
Key Takeaways
- Green coffee beans are unroasted; roasting can cut their chlorogenic acid to about half or to trace levels.
- The 2012 trial behind the hype was retracted by two of its authors because its data could not be verified.
- The FTC said the study's lead investigator repeatedly altered participants' weights and other measurements.
- Meta-analyses find small average weight differences in trials the NIH calls few and of poor quality.
- Most extracts contain caffeine, so count them toward your daily total and ask first if you take medicines.
What is green coffee bean extract?
Coffee beans are the seeds of Coffea arabica and Coffea canephora (robusta), and they stay green until roasted. The NIH Office of Dietary Supplements (ODS) notes that green beans have more chlorogenic acid than roasted beans. A University of California, Davis study measured how much: roasting at 230 degrees Celsius for 12 minutes cut total chlorogenic acids to nearly half, and a darker roast of 21 minutes at 250 degrees left almost trace levels. Extracts are usually standardized to a percentage of chlorogenic acids, such as 45% or 50%, which is what makes them different from brewed coffee.
What is chlorogenic acid?
Chlorogenic acid is a polyphenol formed from caffeic acid and quinic acid. It is found in coffee, tea, fruits and vegetables, as well as in yerba mate. A 2008 study in 10 healthy adults found that the main chlorogenic acids in a decaffeinated green coffee extract were well absorbed and broken down by the body. In mice, the ODS says, green coffee extract reduced fat buildup and changed how glucose is handled, possibly by slowing glucose absorption in the gut. Animal results do not show what happens in people, which is where the story gets complicated.
The 2012 study, the TV segment and the retraction
| When | What happened |
|---|---|
| January 2012 | A 16-person crossover study reports large weight loss with a green coffee extract |
| April 2012 | A Dr. Oz Show segment features green coffee bean extract |
| May 2014 | The FTC sues sellers of Pure Green Coffee over fake news sites and weight claims |
| June 2014 | A Senate subcommittee holds a hearing on weight-loss marketing; Dr. Oz testifies |
| September 2014 | The extract's maker settles FTC charges that it relied on a seriously flawed study |
| October 2014 | Two of the three authors retract the 2012 paper |
| January 2015 | A marketer who promoted green coffee on the same show settles FTC charges |
The 2012 paper described 16 adults with overweight who took a commercial extract or a placebo in a 22-week crossover design and reported dramatic weight loss. In April 2012, the extract was featured on The Dr. Oz Show. Testifying before a Senate subcommittee in June 2014, Dr. Oz said he had used the word “miracle” when describing green coffee on that show. FTC testimony at the same hearing described marketers who, within weeks of the segment, promoted Pure Green Coffee with overblown claims on websites built to look like news outlets.
In September 2014, the FTC settled with Applied Food Sciences, the Texas company that sold the extract used in the study. According to the FTC, the research was carried out in India, and the lead investigator repeatedly altered participants’ weights and other key measurements, changed the length of the trial and misstated who was taking the placebo. The company had then hired university researchers in Pennsylvania to rewrite the study. The settlement requires at least two well-controlled human trials before the company makes future weight-loss claims. A month later, two of the authors retracted the paper, writing that the sponsors could not assure the validity of the data.
Green coffee bean extract weight loss: what other trials show
| Review | Trials included | Average result | Caveats |
|---|---|---|---|
| 2011 meta-analysis | 3 trials | 2.47 kg more weight loss than placebo | All at high risk of bias; results varied widely |
| 2020 meta-analysis | 15 trials, 897 people | 1.23 kg more weight loss; slightly smaller waist | No change in body fat percentage |
| NIH ODS summary | Few trials | Possible modest effect on body weight | All of poor methodological quality |
A 2011 meta-analysis from the University of Exeter found five eligible trials, could pool three, and reported 2.47 kg more weight loss than placebo, but every trial carried a high risk of bias. A larger 2020 meta-analysis of 15 randomized trials with 897 people found an average difference of 1.23 kg and a slightly smaller waist, with no change in body fat percentage. It also found no relationship between the amount of chlorogenic acid and the results, which is not what you would expect if chlorogenic acid were driving weight loss.
Industry funding is common here. A 2021 trial reporting fat loss with a chlorogenic acid complex was written by two employees of the company that makes the ingredient. The ODS summary is cautious: green coffee bean extract might help you lose a small amount of weight, but the trials are few and poorly designed. Our review of whether fat burners work puts that in context with other popular ingredients.
Other green coffee bean extract benefits that have been studied
A 2021 meta-analysis of 15 studies with 637 participants reported small reductions in total cholesterol, fasting glucose and blood pressure, although several pooled results depended heavily on single studies. These are short-term lab and blood pressure readings, not evidence of fewer health problems. There is also a counterpoint: in a 2001 Dutch study of 20 healthy adults, a week of high-amount purified chlorogenic acid raised blood homocysteine, an amino acid linked with heart risk in population studies, by about 12% a few hours after intake. Whether that matters for health is unknown.
Caffeine in green coffee bean extract
Green coffee beans contain caffeine, and the ODS warns that it can cause side effects depending on the amount and whether it is combined with other stimulants. Some extracts are decaffeinated, while others are used specifically as a caffeine source. The ODS also notes that some weight-loss supplement labels list herbal ingredients without declaring how much caffeine they add. For most adults, the FDA cites 400 milligrams of caffeine a day from all sources; our guide on how much caffeine is too much explains who should aim lower. Many formulas pair green coffee with green tea, which brings its own caffeine and safety record, covered in our green tea extract guide.
Side effects and who should be careful
The ODS says green coffee bean extract appears to be well tolerated in trials lasting up to 12 weeks, but its safety has not been rigorously studied and long-term effects are unknown. Watch for:
- Reported side effects: headache and urinary tract infections were reported in trials.
- Caffeine effects: jitteriness, trouble sleeping and a faster heartbeat, especially when stacked with coffee, energy drinks or other stimulants.
- Medicines: ciprofloxacin and theophylline can intensify caffeine’s effects, according to MedlinePlus; ask a pharmacist about your own prescriptions.
- Pregnancy and breastfeeding: ACOG advises less than 200 milligrams of caffeine a day in pregnancy, and many labels say not to use these products while pregnant or nursing.
- Heart rhythm problems, high blood pressure or anxiety: check with a clinician first.
Stop the product and get medical care for chest pain, fainting or a racing, irregular heartbeat.
Reading labels that list green coffee
| Product | Green coffee on the label | Caffeine information | Other notable ingredients |
|---|---|---|---|
| ColonBroom GLP-1 Premium Booster | Extract standardized to 50% chlorogenic acid | No caffeine amount stated | Green tea extract, lemon bioflavonoid, cinnamon |
| Hydroxycut +Women | Robusta extract standardized for 45% chlorogenic acids, in a blend | Warning compares a serving to up to 2 cups of coffee | Caffeine, folate, biotin, iron, collagen |
| Inno Shred GLP-1 | Listed as the source of the formula's caffeine | Caffeine amount stated | Berberine, theobromine, alpha yohimbine |
ColonBroom GLP-1 Premium Booster combines green coffee bean extract with green tea extract, and its label does not state a caffeine amount. Hydroxycut +Women pairs green coffee extract with added caffeine, and its label warns against combining it with other caffeine; it also contains iron, a poisoning risk for young children. Inno Shred GLP-1 uses green coffee bean extract as its caffeine source and also lists alpha yohimbine, a stimulant explained in our yohimbine guide; InnoSupps revised the formula in late 2025, so check the panel on your bottle. Products with GLP-1 in their names are dietary supplements, not GLP-1 medications. A certification seal confirms that a label matches the contents, not that a product works; our guide to third-party tested supplements explains the difference.
Frequently Asked Questions
What is green coffee bean extract?
It is an extract of unroasted coffee beans, usually standardized to chlorogenic acids. Because it is not roasted, it holds much more chlorogenic acid than regular coffee.
Does green coffee bean extract work for weight loss?
Possibly a little. Pooled trials show about one to two and a half kilograms more weight loss than placebo, but the NIH describes the trials as few and of poor quality.
What is chlorogenic acid?
A polyphenol made of caffeic and quinic acids, found in coffee, tea, yerba mate, fruits and vegetables. Roasting breaks much of it down.
Does green coffee bean extract have caffeine?
Usually yes, unless it is labeled decaffeinated. Many labels do not state the amount, so count it toward your daily caffeine.
What are the side effects of green coffee bean extract?
Headache and urinary tract infections have been reported, plus caffeine effects such as jitteriness and poor sleep. Long-term safety has not been well studied.
Why was the famous green coffee study retracted?
Its authors said the sponsors could not assure the validity of the data, and the FTC said the lead investigator had altered weights and other measurements.
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, Green Tea Extract and EGCG: Caffeine, Weight Research and Liver Safety, How Much Caffeine Is Too Much? Daily Limits, Overdose Signs and Label Math.