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Green Coffee Bean Extract

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Green coffee bean extract is an effective tool for weight loss. It also looks very promising for controlling blood sugar and reducing blood pressure.

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We have all seen (and smelled) dark brown roasted coffee beans, but have you ever seen green coffee beans?

Unless you have actually seen coffee beans growing on the plant, you probably haven’t. All coffee beans start out green and are harvested from the Coffea fruit. They only turn brown when we roast them for our daily caffeine fix.

Instead of roasting the beans and making coffee, you could ingest the beans in their purest form for additional health benefits. The extract of green, unroasted coffee beans is sold in pill form as a supplement, and it could help you lose weight, reduce your blood pressure, or even control your blood sugar.

Here is what research says about green coffee bean extract or GCBE.

How Does Green Coffee Bean Extract Provide Health Benefits?

There are two main components in coffee beans that are helpful to our bodies. One is caffeine and the other is polyphenols. For this discussion, we are going to focus on the polyphenols.

Consider a plant’s polyphenols as its protection. Polyphenols work by protecting the plant from ultraviolet light and pathogens according to Pandey & Rizvi (2009)1. In this study, the two researchers suggest that “there has been renewed interest in the potential health benefits of dietary polyphenols as antioxidants.”

Every time you enjoy a cup of coffee, you consume polyphenols including chlorogenic acid, the main active ingredient in green coffee bean extract. However, you won’t get a large dose of chlorogenic acid from roasted coffee beans because the process of roasting the beans breaks it down and actually eliminates the majority of the chlorogenic acid. That is why you won’t see the same benefits from a few cups of coffee as you would from the unprocessed beans.

Therefore, green coffee beans are crushed into a powder form and sold as a supplement in the form of a pill. This method preserves the chlorogenic acid and delivers the most health benefits.

Weight Loss & The Battle Against Obesity

The battle of the bulge seems to be an unending one. According to the World Health Organization2:

  • Worldwide obesity has nearly tripled since 1975.
  • 9 billion adults were overweight or obese in 2016.
  • 340 million children and adolescents aged 5-19 were overweight or obese in 2016
  • 41 million children under the age of 5 were overweight or obese in 2016

Researchers, now more than ever, are interested in natural ways to combat this pandemic.

In one meta-analysis by Onakpoya et al. (2011)3, a number of studies were examined to determine if green coffee bean extract, GCBE, was effective as a weight loss supplement. Their results were that the “overall meta-analysis revealed a (statistically) significant difference in change in body weight between green coffee bean extract and placebo.” Participants using GCBE were successful with moderate weight loss. Therefore, the researchers feel green coffee bean extract should be further studied as a weight-loss tool.

Another meta-analysis in Natural Medicine Journal (2014)4 found similar results when analyzing six studies. They also concluded that there was a large size effect for overweight and/or obese participants who were treated with GCBE.

A recent study on mice by Choi et al. (2016)5 attests that their study results show “markedly ameliorated” body fat accumulation with the test groups using GCBE. In addition, the participants had reduced body weight gain, fat mass, adipocyte sizes, WAT weight, and plasma lipid levels. In the discussion of the study, Choi and his team stated, “We confirm that the active compound 3-CQA from GCBE, reduces body fat accumulation by the regulation of adipogenesis [fat building] and lipogenesis [fat breakdown] in obesity. Thus, these findings demonstrate that GCBE represents a potential activity that prevents the development of obesity, hyperlipidemia and its complications in diseases.”

Finally, a very recent meta-analysis by Gorgi et al. (2019)6 that analyzed data across 13 articles and 16 studies concluded that green coffee bean extract is an effective supplement for the improvement of obesity indices. The researchers stated that the “results of current meta-analysis study support the use of GCBE supplementation for the improvement of obesity indices, with sub-group analysis highlighting greater improvements in individuals with a starting BMI ≥25 kg/m2.

Although there are early studies that say there is not enough evidence to prove that GCBE supports weight loss and other obesity-related factors, the most recent studies and analyses show that green coffee bean extract is an effective tool in combating obesity.

The best way to determine if it will work for you is to try it yourself.

Reduce Blood Pressure

High blood pressure often accompanies being overweight. It is also one of the leading causes of stroke. Fortunately, GCBE has been studied as a natural way to reduce blood pressure. Researchers like Zhao et al. (2012)7 feel that the supplemental use of chlorogenic acid, or GCA, from green coffee bean extract “holds promise for providing a non-pharmacological approach for the prevention and treatment of high blood pressure.”

In one study by Watanabe et al. (2006)8, they determined that green coffee bean extract is not only effective in animal trials, but also in human trials. Throughout this study, participants’ blood pressure, pulse rate, body mass index, and other statistics were recorded. What they revealed was that only the CGA group had a significant decrease in blood pressure, both systolic and diastolic.

Researchers stated that none of the subjects lost weight nor did they report that there were any side effects from taking GCBE. The conclusion from this study is that chlorogenic acid from green coffee bean extract is effective in decreasing blood pressure, and it is safe for patients with mild hypertension.

In another study by Suzuki et al. (2006)9, 117 males with mild hypertension were given GCBE in increasing doses for a month, up to 185 milligrams per day the final week of the study. At the end of the study, participants in the test group had significantly improved blood pressure as compared to placebo groups. As the milligrams of the doses increased each week, the results for the participants increasingly improved as well showing that the GCBE was effective.

Another study by Revuelta-Iniesta & Al-Dujaaili (2014)10 analyzed the impacts of green coffee versus black coffee on cardiovascular markers. The results indicated that “consumption of green coffee significantly improved arterial elasticity and reduced systolic and diastolic blood pressure” in participants.

It is also worthy of noting that in the above study, both groups had a decreased BMI, but only the test group using green coffee had significantly reduced abdominal fat. None of the participants were placed on a diet or exercise program.

Even more recently, a meta-analysis of 9 studies by Han et al. (2019)11 affirms the above findings. They concluded that evidence supports the use of green coffee bean extract for hypertensive patients because it does significantly improve blood pressure.

Controlling Blood Glucose

Type-II diabetes is the most common form of diabetes. The World Health Organization12 asserts that:

  • The global prevalence of diabetes among adults over 18 years of age has risen from 4.7% in 1980 to 8.5% in 2014
  • Almost half of all deaths attributable to high blood glucose occur before the age of 70 years. WHO estimates that diabetes was the seventh leading cause of death in 2016.

These staggering statistics show that keeping blood glucose levels under control is imperative. Finding a natural way to help control blood glucose is ideal.

Regular coffee consumption has been associated with a lower risk of Type II diabetes across all categories of people of differing sexes, geographical locations, and obesity levels according to several studies including Lin et al. (2011)13. It makes sense that green coffee bean extract has been vastly studied for its anti-diabetic benefits because it is higher in CGA content than roasted coffee.

In an early study on mice by Ong et al. (2012)14, researchers were able to demonstrate that CGA decreased fasting blood glucose in mice using a glucose tolerance test.

Similar results were found in a 12-week study on late diabetic mice. Jin et al. (2015)15 studied the effects of chlorogenic acid, CGA, found in GCBE, on factors that impact diabetics such as blood glucose stabilization, body weight, and glycosylated hemoglobin that impact type II diabetics. Glycosylated hemoglobin is caused by the presence of excessive sugar in the bloodstream and is often an indicator of diabetes. What they found is that in the mice treated with CGA all had significantly reduced body fat percentages, reduced fasting plasma glucose, and glycosylated hemoglobin.

A very recent randomized clinical trial was conducted by Roshan et al. (2018)16 to test the effects of green coffee bean extract on:

  • glycemic control
  • blood pressure
  • lipid profile
  • insulin resistance
  • and appetite in patients with the metabolic syndrome

The participants in the test group were given 400 milligrams of green coffee bean extract twice per day for 8 weeks. After the test period, the results for the GCBE showed significantly reduced blood pressure, fasting blood glucose, and stability in insulin resistance. The placebo group and GCBE group both had a reduction in weight and BMI. However, the GCBE group lost twice as much as the placebo group in both categories. Researchers also noted that green coffee bean extract may help with appetite control.

Whether you are pre-diabetic or diabetic, you might consider using green coffee extract to help control your blood sugar. However, if you are on prescription medications, you should talk to your doctor first.

What To Look For When Buying Green Coffee Bean Extract & Dosing

In a review of many studies by Vinson et al. (2019)17, they looked at multiple GCBE supplements that are on the market. They compared and contrasted the supplements to determine what is actually in the products by measuring things such as the actual concentration of GCBE and/or CGA (chlorogenic acid) in each supplement.

Based on their reviews, you may want to keep these items in mind when purchasing and consuming a GCBE supplement:

Safe Dosage

Vinson and his team stated that “although the effective dosage of green coffee bean extract for use as a weight-loss supplement has not been definitively established, the minimum daily dose used in the two earlier published studies that resulted in significant weight loss was 200 mg of CGA.”

Keep in mind that in the Roshan study, participants took a total of 800 milligrams per day.  How much is actually safe?

WebMD18 asserts that each person’s dosage should be independently determined based on age, gender, and current health status. Be sure to follow the directions on the label of the product you buy and be aware of the number of milligrams of CGA, chlorogenic acid, you are consuming each day.

Be aware that green coffee bean extract products naturally contain caffeine. If your caffeine tolerance is low, it may impact you differently than someone who has a high tolerance.  Due to this, you may experience restlessness, trouble sleeping, frequent urination, increased heart rate, increased anxiety (if you have anxiety issues), jitters, or upset stomach.

Comparing Product Concentration

Vinson and his team then looked at the concentration of GCBE in the supplements. Based on their analysis they reported that “two out of three of these had <10% CGA. The marketing literature touts 50% CGA as being the gold standard of GCBE products.”

Concentration is also important. If the concentration is low, you aren’t receiving enough of active ingredient for it to be effective unless you are taking numerous pills per day. It would be worth the money to pay more for a product that contains a higher concentration of CGA so that you take fewer pills per day.

All of the information you need to make a purchasing decision will be listed on the product label. It is also a good idea to look at product reviews and ratings from verified consumers.


Based on the above research, green coffee bean extract is an effective tool for weight loss and combating obesity. It also seems very promising for controlling blood sugar and reducing blood pressure. However, you should also talk to your doctor about any new supplements you would like to try, especially if you are on prescription medications.

Supplement Facts

Serving Size: 2 capsules Servings Per Container: 30

IngredientAmount Per Serving%DV
Green Coffee Bean Extract
(Standardized for 50% Chlorogenic Acids)

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