Green (Raw) Coffee Bean Extract Chlorogenic Acid Side Effects

Green (Raw) Coffee Bean Extract Chlorogenic Acid Side Effects:

Coffee beans are naturally green, but they are commonly roasted before being sold to the consumer. This is the process that turns them brown.

Chlorogenic acid (CGA) is the main active ingredient in green coffee beans. That is the compound that produces the weight loss effects.

Green coffee beans usually contain 6 percent to 7 percent of this substance, with roasted coffee beans having less, as the roasting transforms CGA into other molecules.

One of the biggest proponents of green coffee extract for weight loss has been Dr. Oz, who cited a study that tied green coffee to weight loss, asserting that people who took it lost an average of 18 pounds in 6 weeks.

One major problem with that study, published in the journal Diabetes, Obesity and Metabolic Syndrome, was that it involved only 16 subjects.

Remember! The majority of the studies into the effects of CGA on humans have been sponsored by industry, with a considerable investment in the positive outcomes of those studies.

Sponsorship bias or funding bias is a well-known and recognized phenomenon. In 2012, the Cochrane Collaboration published one of their famous systematic reviews of the issue, finding that:

“Sponsorship of drug and device studies by the manufacturing company leads to more favorable results and conclusions than sponsorship by other sources.”

For example, in 2011, a review or meta-analysis of a number of research studies on the effectiveness of CGA for weight loss was published in Gastroenterology Practice and Research.

The reviewers established that while the results of the studies showed promise, the methodology of many of the studies was poor. Additionally, an author of one of the studies reviewed had received funding from a company that manufactures green coffee extract.

Side effects of chlorogenic acid

Green coffee does contain caffeine, which can have many side effects when consumed.anxiety stress

This includes rapid heartbeat, lethargy, indigestion, trouble breathing, anxiety, jitteriness, increases the risk of heart attacks among young adults, and increases the amount of calcium, flushed out in the urine – which in turn might weaken bones. Also, despite the common wisdom of drinking coffee to recover from too much alcohol, in reality, caffeine doesn’t help your body process alcohol any faster.

Caffeine provides no nutritional value. It’s tasteless, so you don’t automatically know if it’s in your food.

In addition, studies suggest caffeine contained in green coffee bean extract can alter the way people, particularly those with diabetes, absorb sugar. It’s been noted to cause both increases and decreases in blood sugar. So, if you have diabetes, use caffeine with caution and monitor your blood sugar regularly.

CGA has been linked with increased levels of the protein amino acid homocysteine (a naturally occurring amino acid produced as part of the body’s methylation process). Increased homocysteine levels are linked to an increase in the risk of cardiovascular disease.

Furthermore, the absorption of minerals such as selenium, iron, magnesium, and zinc is reduced when chlorogenic acid is taken within about 60 minutes of the meal.

Pregnancy & Breastfeeding

Since green coffee bean extracts affect fat metabolism, women who are breastfeeding or pregnant should not take pure green coffee extract.

People who are on medication for serious illnesses, such as diabetes or heart disease, should also avoid green coffee capsules. Additionally, children should also refrain from consuming green coffee supplements.


While experts continue to experiment and analyze the potential health benefits of chlorogenic acid in green coffee bean extract, always speak to your healthcare specialist before taking any supplements.


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2 thoughts on “Green (Raw) Coffee Bean Extract Chlorogenic Acid Side Effects”

  1. I purchased a supplement having chlorogenic acid 50% (Name: Eco Slim) through online buying; to reduce my weight. I am 40 years old, my weight is 90 kgs and height is 180 cm. I don’t have sugar or blood pressure issues (fall in normal values). Is it safe for me to use this supplement or not? Please inform me if you need any other information and I’ll share it with you but I need someone to guide me through this before I actually use the supplement.

    • Hi, Muhammad Ahmad Mehboob. After reading the ingredients, my opinion is that this supplement looks safe for most people. But, if you want to lose weight you should also follow the next steps:
      1. Go to bed at 10 pm.
      2. Increase your fiber intake, at least 50 g per day.
      3. Physical exercise – minimum 90 minutes of walking per day.
      4. Avoid vegetable oils and limit the intake of foods high in fat.
      5. Don’t eat after 6 pm.


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