Green Tea Extract Weight Loss Side Effects

Green tea extract has antioxidant properties, as it contains a high concentration of polyphenols, as described by the University of Maryland Medical Center (UMMC). It likewise may improve metabolic process and help burn fat. You can use green tea extract for weight loss by consuming the tea or taking green tea as a supplement.

What AreĀ Green Tea Extract Weight Loss Side Effects?

One research study, as noted by the UMMC, has actually found that green tea with caffeine improved weight loss and weight upkeep in overweight people.

Caffeine Effects

Green tea extract includes caffeine, and drinking large quantities of caffeine can cause lots of side effects, according to the UMMC. This is especially true for individuals not accustomed to caffeine. Possible side effects include dizziness, insomnia, anxiety, irritability, tense feelings, restlessness and fast pulse. Big amounts of caffeine also can cause upset stomach, nausea and diarrhea. Caffeine overdose is possible, with symptoms of headache, abdominal spasms, nausea and vomiting. Caffeine overdose may require medical attention.


Because it consists of caffeine, green tea extract is a diuretic and causes the body to lose water, as described by doctor Andrew Weil. Dehydration may occur if you do not renew water lost through frequent urination, as cells start drawing water from the blood. Drink lots of non-caffeinated fluids while using green tea for weight loss.

More Serious Effects

Caffeine can also result in more serious health effects, according to Weil. It can result in heart palpitations and irregular heartbeat, and might cause or aggravate hypertension. Caffeine likewise is related to prostate problems and other urinary disorders. The compound is an irritant to the urinary tract and causes smooth muscle of the bladder and prostate to constrict, which can make urination difficult.

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Liver Issues

Some people have reported liver problems while taking focused green tea extract, according to the U.S. National Institutes of Health (NIH). This side effect is not connected with drinking green tea drinks or infusions. These cases are very unusual and not definitively connected to green tea. The NIH recommends that people take concentrated green tea extracts with food, and stop using green tea extract and seek medical attention if signs of liver problems happen, such as dark urine or jaundice.

Drug Interaction

Green tea extract may cause a severe rise in blood pressure when taken with monoamine oxidase inhibitors (MAOIs), medications recommended for treating depression, according to the UMMC, according to This side effect can be life-threatening. People taking MAOIs ought to not use green tea for weight loss or any other factor.


  • The following dosages have been studied in clinical research:
  • For high cholesterol: Green tea or green tea extracts containing 150 to 2500 mg catechins, taken in single or 2 divided doses daily for as much as 24 weeks, has actually been used.
  • For unusual development of cells of the cervix (cervical dysplasia): 200 mg of green tea extract, taken by mouth daily together with a green tea ointment used two times weekly for 8-12 weeks, has actually been used.
  • For high blood pressure: A green tea drink, made by boiling a 3 gram tea bag with 150 mL water, has actually been used three times day-to-day about 2 hours after each meal for 4 weeks. Likewise, 379 mg of a specific product containing green tea extract (Olimp Labs, Debica, Poland), taken daily with the breakfast for 3 months, has actually been used.
  • For low blood pressure: 400 mL of green tea extract taken prior to lunch has actually been used.
  • For thick, white spots on the gums (oral leukoplakia): 3 grams of combined green tea taken by mouth and applied to the skin for 6 months has been used.
  • For osteoporosis: Capsules consisting of 500 mg of green tea polyphenols, taken two times daily alone or while practicing tai chi for 60 minutes 3 times regular for 24 weeks, has been used.



Updated: September 4, 2016 — 7:13 pm

The Author

Reyus Mammadli

Healthy lifestyle advisor. Bachelor Degree of Medical Equipment and Electronics.
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