Are There Benefits to Green Coffee Extract?

By: Alere Staff
Publication Date: Tue, 07/01/2014

Green coffee extract has grown in popularity over the last several years, especially after being mentioned on television as a weight loss product. Green coffee beans are coffee beans that have not yet been roasted.

The roasting process of coffee beans reduces amounts of the chemical chlorogenic acid. Green coffee beans have a higher level of chlorogenic acid compared to regular, roasted coffee beans. Chlorogenic acid in green coffee is thought to have health benefits for heart disease, diabetes, weight loss, and others.1

Some research shows that people with mild high blood pressure who take green coffee extract have reduced blood pressure after so many days of treatment. Other studies evaluating the effects of a different green coffee extract or a certain component of green coffee found similar results.2

Studies on weight loss have been inconsistent, with some studies saying that green coffee extract does not help with weight loss and some studies saying that it does help.3,4 Many of these studies are preliminary, sometimes poor quality, and may have questionable motives.

Currently, there have been no studies conducted to review any interactions with warfarin.There is also no information about vitamin K levels in green coffee bean extract. Keep in mind though, green coffee extract does have similar side affects to brewed coffee, such as feeling jittery from the caffeine, etc.5

Talk to your doctor before taking any new medications, supplements, weight loss pills, etc. Your doctor may need to monitor your INR more closely during the change and more frequent testing may help to determine if there was an interaction with warfarin.

  1. Madhava Naidu, M., et al. "Studies on extraction andantioxidant potentialof green coffee." Food Chemistry 107.1 (2008): 377-384.
  2. SuzukiA, et al.Greencoffee beanextract andits metabolites have a hypotensive effect inspontaneously hypertensive rats. Hypertens Res. 2002 Jan;25(1):99-107.
  3. Onakpoya, Igho, Rohini Terry, andEdzard Ernst. "The use of green coffee extract as a weight loss supplement: a systematic reviewand meta-analysisof randomised clinical trials." Gastroenterology research and practice 2011 (2010).
  4. Vinson, Joe A., BryanR. Burnham, and Mysore V. Nagendran. "Randomized, double-blind, placebo-controlled, linear dose,crossoverstudy to evaluate the efficacy and safety ofa green coffee beanextract inoverweight subjects." Diabetes, metabolic syndrome and obesity: targets andtherapy 5 (2012): 21.
  5. U.S. Department ofAgriculture, AgriculturalResearch Service. 2004. USDA National Nutrient Database for Standard Reference, Release 17. Nutrient Data Laboratory Home Page,