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Table of Contents > Herbs & Supplements > Green coffee Print

Green coffee


Related terms

Related Terms
  • 2-Methoxy-3-(2-methylpropyl)-pyrazine, 2-methoxy-4-vinylphenol, 2-methoxy-5-vinylphenol, 2-methylbutanoic acid, 3-isobutyl-2-methoxypyrazine, 3-methyl butanoic acid, 3-methyl butanol, 3-methylbut-2-enoyl disaccharides, 3-methylbut-2-enoyl-1-O-beta-D-glucopyranosyl-beta-D-apiofuranoside, 3-methylbutanoic acid, 3-methylbutanoyl disaccharides, 3-methylbutanoyl-1-O-beta-D-glucopyranosyl-beta-D-apiofuranoside, 3-methylbutanoyl-6-O-alpha-D-glucopyranosyl-beta-D-fructofuranoside, 4-hydroxy-3-methylacetophenone, 5-caffeoylquinic acid (5-CQA), 5-chlorogenic acid (5-CGA), 5-hydroxymethyl-2-furfural, 5-hydroxymethyl-2-furoic acid, acrylamide, alanine, alpha-dicarbonyl compounds, alpha-galactosidase, arabinogalactans, asparagine, benzoic acids, bornesitol, caffeic acid, caffeine, caffeoylquinic acid (CQA), calcium, catechin, catechols, chicoric acid, chlorinated hydrocarbons, chlorogenic acid (CA, CGA), chlorogenic acid lactones, cinnamoylquinides, Coffea arabica, Coffea canephora, Coffea robusta, coffee berry, coffee cherry, coffeeberry, CoffeeSlender®, diacetyl, dicaffeoylquinic acid, dihydrocaffeic acid, dihydroferulic acid, epicatechin, ferulic acid, feruloylquinic acid, furan, galactomannans, gallic acid, glyoxal, green coffee bean extract (GCBE), green coffee extract (GCE), hexanol, hippuric acid, hydrogen peroxide (H2O2), hydroxycinnamates, hydroxycinnamic acid, hydroxyhydroquinone (HHQ), iron, isoferulic acid, lignans, magnesium, Maillard reaction products, mannitol, m-coumaric acid, melanoidins, methylglyoxal, methylxanthine, myo-inositol, nicotinic acid (niacin), N-methylpyridinium, ochratoxin-A (OTA), phenyl ethyl alcohol, phenylpropionic acids, phytochemicals, polyalcohols, polycyclic aromatic hydrocarbons, polyphenols, premelanoidins, protocatechuic acid, quinic acid, quinides, raw coffee, rho-coumaric acid, rho-hydroxybenzoic acid, selenium, sinapic acid, sulfur, Svetol®, tannic acid, tannins, theobromine, theophylline, trigonelline, tryptamine, unroasted coffee, vanillic acid, volatile Maillard reaction products (vMRPs).

  • "Green coffee" refers to the raw, unroasted seeds (beans) of Coffea fruits. Green coffee beans are cleaned, dried, roasted, ground, and brewed to produce the popular beverage coffee. The main Coffea species used for beverage production are Coffea arabica and Coffea canephora (synonym, Coffea robusta).
  • Coffee is a popular source of caffeine. However, it also contains many other components that are believed to have health benefits, such as lowering blood sugar levels. These components include chlorogenic acid, quinides, lignans, and trigonelline.
  • Studies suggest that caffeinated coffee consumption may increase blood pressure and potentially increase the risk of heart disease. However, these results were not found to be true of decaffeinated coffee, and some trials found that chlorogenic acid may actually lower blood pressure. Researchers believe that the differing effects of roasted and raw coffee are due to a compound called hydroxyhydroquinone (HHQ), which is created from the roasting process and may block the beneficial effects of chlorogenic acid on blood pressure.
  • Scientists believe that genes and gender may play a role in determining how people respond to chlorogenic acid. One study found that coffee consumption led to better insulin sensitivity in women, but not in men. However, further research is needed in order to better understand these findings.

Evidence Table

These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. GRADE *

Some studies found that chlorogenic acid in green coffee extract may lower blood pressure. More studies are needed before further conclusions can be made.


Coffee consumption has been linked to increased blood pressure and higher levels of homocysteine, which are risk factors for heart disease. Further studies are needed to better understand this link.


Studies suggest that coffee may improve blood sugar levels and reduce the risk of type 2 diabetes. More evidence is needed to understand the benefits of each component in green coffee, as well as long-term effects.


Green coffee extract may improve weight in obese people. However, there is conflicting evidence, and more research is needed to confirm this benefit.

* Key to grades

A: Strong scientific evidence for this use
B: Good scientific evidence for this use
C: Unclear scientific evidence for this use
D: Fair scientific evidence for this use (it may not work)
F: Strong scientific evidence against this use (it likley does not work)

Tradition / Theory

The below uses are based on tradition, scientific theories, or limited research. They often have not been thoroughly tested in humans, and safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. There may be other proposed uses that are not listed below.

  • Aging, antiviral, cancer, cardiovascular health (heart health), cirrhosis (impaired liver function), colorectal cancer, diabetes, hepatitis B, hepatocellular carcinoma (liver cancer), infections, inflammation, liver disease, metabolic abnormalities (metabolic syndrome), Parkinson's disease, pellagra (niacin deficiency).


Adults (18 years and older)

  • To reduce the risk of heart disease, a green coffee extract beverage containing 140 milligrams of chlorogenic acid has been taken by mouth daily for four months.
  • To improve blood sugar levels, 0.9 grams of Svetol® green coffee extract, 10 grams of CoffeeSlender® coffee, and 25 grams of sugar have been added to water and taken by mouth. One Svetol® tablet containing 200 milligrams of green coffee extract has been taken by mouth three times daily for 40 days.
  • To treat high blood pressure, 46 milligrams, 93 milligrams, and 185 milligrams of green coffee have been taken by mouth once daily for 28 days. A dose of 70-280 milligrams of chlorogenic acid has been taken by mouth daily for 12 weeks.
  • To manage obesity, 200 milligrams of Svetol® green coffee extract in 2,200 milligram sachets of caffeinated CoffeeSlender® coffee has been taken by mouth five times daily for 12 weeks.

Children (under 18 years old)

  • There is no proven safe or effective dose for green coffee extract in children.


The U.S. Food and Drug Administration does not strictly regulate herbs and supplements. There is no guarantee of strength, purity or safety of products, and effects may vary. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy. Consult a healthcare provider immediately if you experience side effects.


  • Avoid using in people who are allergic or sensitive to coffee, coffee parts (including molds and fungal toxin), and castor beans.

Side Effects and Warnings

  • Green coffee extract is considered safe in healthy people when taken by mouth in recommended doses for up to four months.
  • Green coffee extract may lower blood sugar levels. Caution is advised in people with diabetes or hypoglycemia, and in those taking drugs, herbs, or supplements that affect blood sugar. Blood glucose levels may need to be monitored by a qualified healthcare professional, including a pharmacist. Medication adjustments may be necessary.
  • Green coffee extract may cause low blood pressure. Caution is advised in people taking drugs or herbs and supplements that lower blood pressure.
  • Use cautiously in people who are overweight or obese, and in people who have heart disease or high blood pressure.
  • Avoid in people who are taking beta-blockers.
  • Avoid using in pregnant women, due to an increased risk of miscarriage, premature delivery, and low birthweight. Avoid using in breastfeeding women, due to a lack of safety information.
  • Green coffee extract may cause asthma, conjunctivitis (eye problems), coughing, decreased cholesterol, difficulty breathing, headache, increased allergic responses, increased blood pressure, increased heart rate, increased levels of homocysteine in the blood, increased risk of heart disease, increased risk of urinary tract infection, increased use of blood pressure-lowering drugs, kidney problems, narrowing of the bronchus, nausea, rhinitis (runny or stuffy nose), weight gain, and wheezing.
  • Note: Caffeine-related side effects may vary depending on the type of green coffee extract.

Pregnancy and Breastfeeding

  • There is currently a lack of scientific evidence on the use of green coffee extract during pregnancy or breastfeeding.


Interactions with Drugs

  • Green coffee extract may lower blood sugar levels. Caution is advised when using medications that may also lower blood sugar. People taking insulin or drugs for diabetes by mouth should be monitored closely by a qualified healthcare professional, including a pharmacist. Medication adjustments may be necessary.
  • Green coffee extract may cause low blood pressure. Caution is advised in people taking drugs that lower blood pressure.
  • Green coffee extract may also interact with agents that may reduce anxiety, antibiotics, anticancer agents, anticholinergics (agents that may block nerve impulses), antifungals, anti-inflammatories, antiobesity agents, antivirals, beta-blockers, calcium salts, cholesterol-lowering agents, cholinergic agonists (agents that may enhance nerve impulses), and iron salts.

Interactions with Herbs and Dietary Supplements

  • Green coffee extract may lower blood sugar levels. Caution is advised when using herbs or supplements that may also lower blood sugar. Blood glucose levels may require monitoring, and doses may need adjustment.
  • Green coffee extract may cause low blood pressure. Caution is advised in people taking herbs or supplements that lower blood pressure.
  • Green coffee extract may also interact with antibacterials, anticancer herbs and supplements, anticholinergics (herbs and supplements that may block nerve impulses), antifungals, anti-inflammatories, antiobesity herbs and supplements, antivirals, beta-carotene, calcium, carcinogenic or oxidative herbs and supplements (agents that may cause cancer), cholesterol-lowering herbs and supplements, cholinergics (herbs and supplements that may enhance nerve impulses), clove oil, cyclodextrin, curcumin, garlic, herbs and supplements that may reduce anxiety, iron, milk protein, minerals, probiotics, and vitamin E.

  • This information is based on a systematic review of scientific literature edited and peer-reviewed by contributors to the Natural Standard Research Collaboration (

  1. Agardh EE, Carlsson S, Ahlbom A, et al. Coffee consumption, type 2 diabetes and impaired glucose tolerance in Swedish men and women. J.Intern.Med. 2004;255(6):645-652.
  2. Arion WJ, Canfield WK, Ramos FC, et al. Chlorogenic acid and hydroxynitrobenzaldehyde: new inhibitors of hepatic glucose 6-phosphatase. Arch.Biochem.Biophys. 3-15-1997;339(2):315-322.
  3. Dupas C, Marsset, Baglieri A, et al. Chlorogenic acid is poorly absorbed, independently of the food matrix: A Caco-2 cells and rat chronic absorption study. Mol.Nutr.Food Res. 2006;50(11):1053-1060.
  4. Greenberg JA, Boozer CN, and Geliebter A. Coffee, diabetes, and weight control. Am.J.Clin.Nutr. 2006;84(4):682-693.
  5. Herling AW, Burger HJ, Schwab D, et al. Pharmacodynamic profile of a novel inhibitor of the hepatic glucose-6-phosphatase system. Am.J.Physiol 1998;274(6 Pt 1):G1087-G1093.
  6. Higdon JV and Frei B. Coffee and health: a review of recent human research. Crit Rev.Food Sci.Nutr. 2006;46(2):101-123.
  7. Hu G, Jousilahti P, Nissinen A, et al. Coffee consumption and the incidence of antihypertensive drug treatment in Finnish men and women. Am.J.Clin.Nutr. 2007;86(2):457-464.
  8. Mori H, Kawabata K, Matsunaga K, et al. Chemopreventive effects of coffee bean and rice constituents on colorectal carcinogenesis. Biofactors 2000;12(1-4):101-105.
  9. Namba T and Matsuse T. [A historical study of coffee in Japanese and Asian countries: focusing the medicinal uses in Asian traditional medicines]. Yakushigaku.Zasshi 2002;37(1):65-75.
  10. Olthof MR, Hollman PC, Zock PL, at al. Consumption of high doses of chlorogenic acid, present in coffee, or of black tea increases plasma total homocysteine concentrations in humans. Am.J.Clin.Nutr. 2001;73(3):532-538.
  11. Suzuki A, Fujii A, Jokura H, et al. Hydroxyhydroquinone interferes with the chlorogenic acid-induced restoration of endothelial function in spontaneously hypertensive rats. Am.J.Hypertens. 2008;21(1):23-27.
  12. Suzuki A, Fujii A, Yamamoto N, et al. Improvement of hypertension and vascular dysfunction by hydroxyhydroquinone-free coffee in a genetic model of hypertension. FEBS Lett. 4-17-2006;580(9):2317-2322.
  13. Suzuki A, Kagawa D, Ochiai R, et al. Green coffee bean extract and its metabolites have a hypotensive effect in spontaneously hypertensive rats. Hypertens.Res. 2002;25(1):99-107.
  14. van Dam RM and Hu FB. Coffee consumption and risk of type 2 diabetes: a systematic review. JAMA 7-6-2005;294(1):97-104.
  15. Yamaguchi T, Chikama A, Mori K, et al. Hydroxyhydroquinone-free coffee: a double-blind, randomized controlled dose-response study of blood pressure. Nutr.Metab Cardiovasc.Dis. 2008;18(6):408-414.

Copyright © 2011 Natural Standard (

The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.

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