Green Coffee Bean Extract

Green Coffee Bean Extract Obesity is one of the most studied diseases in the developed world today. It is a major public heath issue, and is associated with a number of diseases such as coronary artery disease, diabetes, metabolic disorders, heart disease, high blood pressure, cancer, and many psychiatric conditions. In 2004, 32.9% of adults 20-74 years old were obese and more than 17% of teenagers (age, 12-19 y) were overweight. For years, we have searched for medications or supplements that provide weight loss with minimal or no side effects.

Pure Green Coffee Bean Extract is a relatively new product that has gotten a lot of attention recently particularly because its been mentioned several times by Dr. Oz on his show. It derives from the Coffea Arabica Plant. There are two types of Coffee plants (Robusta and Arabica). Arabica possesses the most chlorogenic acids, thus the strongest antioxidant properties. Its antioxidant properties are primarily due to the polyphenols. The polyphenol family is also known as chlorogenic acids, which have been found to reduce blood pressure and produce weight loss in randomized studies. Chlorogenic acid has also been found to neutralize carcinogenic compounds thus preventing them from damaging DNA and causing mutations that can cause other illnesses.

Benefits and available research.

Weight loss.

Randomized, double-blind, placebo-controlled, linear dose, crossover study to evaluate the efficacy and safety of a green coffee bean extract in overweight subjects.

Diabetes Metab Syndr Obes. 2012; 5: 21–27.

Subjects received high-dose GCA (1050 mg), low-dose GCA (700 mg), or placebo in separate six-week treatment periods. Measurements were body weight, body mass index, and percent body fat. Heart rate and blood pressure were also measured. Significant reductions were observed in body weight, body mass index, and percent body fat , as well as a small decrease in heart rate.

This study concludes that the results are consistent with human and animal studies and a meta-analysis of the efficacy of green coffee extract in weight loss. 

Lower blood pressure.

The blood, pressure-lowering effect and safety of chlorogenic acid from green coffee bean extract in essential hypertension.

Clin Exp Hype. 2006 Jul;28(5):439-49.

Subjects were randomized to receive treatment with CGA (140 mg/day) from GCE or placebo. Blood pressure, pulse rate, body mass index, routine blood test, hematochemistry, urinalysis, and subjective symptoms were recorded throughout the study. In the CGA group, but not the placebo group, blood pressure (systolic and diastolic) decreased significantly during the ingestion period.

Diabetes prevention.

It has been suggested that consuming green bean coffee extract has a positive effect in preventing diabetes. I couldn’t find any scientific evidence to support this claim.

Dosage and side effects.

The most beneficial results were seen when subjects took between 140mg to 185mg per day. Green bean coffee extract is thought to be a safe substance. In human trials, no significant adverse effects have been seen.

Please note that green bean coffee extract only contains about 20% of the caffeine found in a strong cup of coffee.


I normally would not recommend a weight loss supplement because most have absolutely no scientific evidence to support their claim. This product has several randomized scientific clinical trials with conclusive evidence to support its weight loss claims. I still believe that diet and exercise are the key to weight loss and a healthy lifestyle, however taking this product as a “supplement” seems like a good option for those seeking weight loss. Green coffee bean extract has been found to lower blood pressure in a randomized clinical trials, and to reduce body weigh, body mass index, and body fat. It is considered a safe product to consume, and has not been linked to any significant side effects in human trials. As far as diabetes prevention, there is no scientific evidence to suggest this claim, therefore I would not recommend this product for diabetes prevention.

Thumbs up for weight loss and to lower blood pressure.

Thumbs down for diabetes.

Questions and Answers. 

What is green bean coffee extract?

It is a natural substance that is extracted from unroasted coffee beans. Coffee beans are green in their natural form, and turn brown once they are roasted. Green coffee beans contain a substance known as chlorogenic acid which is the active weight loss compound found in this product. Roasting the coffee beans destroys the chlorogenic acid, therefore drinking coffee in its regular form has no weight loss benefits.

What is clorogenic acid?

Clorogenic acid acts by triggering the liver to stop releasing glucose into the blood stream, at the same time it boosts the bodies metabolism so that the liver would burn more fat. As a result, less fat is absorbed and you loose weight. In addition to its known weight loss effects it also neutralizes several classes of carcinogenic compounds and prevents them from damaging DNA and causing mutations that can cause other illnesses.

What is the daily dose for weight loss?

Most available supplements usually vary from a 30 percent to 50 percent chlorogenic acid concentration.  Both 200 and 400 mg pure green coffee bean capsules are available in the US. I suggest taking  two capsules before meals with a glass of water. You can do this twice a day and increase the dose to three times a day if you don’t experience any side effects.

Will I get nervous and anxious from the caffeine?

Green bean coffee extract contains caffeine, but in a much lower concentration that regular brewed coffee. In fact, it only contains about 20% of that found in a strong cup of coffee. Even with the caffeine found, green coffee beans are not considered to be stimulants therefore do not cause nervousness, anxiety, or other effects found in regular coffee. A recent study found that people who take green coffee bean extract daily had a lower heart rate than those who don’t.

How much weight can I expect to loose?

In one trial, subjects were followed for a 22 week period and found an average loss of 2kg (aprox 4.5 pounds) after 22 weeks. Their body fat also dropped by 1% during that period. Although many “testimonials” online refer much faster and greater weight loss, I’m forced to believe what has been scientifically found.

What forms does green coffee bean extract come in and which form should I take?

There are both tablet and capsule forms. The most important thing is to be sure the ones you are taking are pure. This means that it contains no fillers or binders. Most products on the market contain fillers which should be avoided. Capsules are generally easier to digest and absorb than tablets.

Can my teenage child take green coffee bean extract? 

Although it is probably harmless, I wouldn’t recommend this product for children or teenagers due to a lack of information within those age groups.