Health, Nutrition

25 Green Tea Side Effects Worth Knowing

Here are 25 green tea side effects, their nutritional values, and how you should be consuming this tea with caution. Green tea has a lot of health benefits and is known to aid in the weight loss process but you also need to be aware of its side effects as well. Read on to learn more on how to add this tea to your diet the right way.

25 Green Tea Side Effects

25 Green Tea Side Effects Worth Knowing

Green tea is one of the healthiest herbal teas in the world, famous for its numerous health benefits and weight loss properties, even though there is no conclusive evidence that green tea aids in weight loss, studies show that green tea contains minerals that can speed up the metabolism which is a key factor in losing weight. In this post, we will be covering the side effects of green tea so keep on reading!

Nutritional value per 100 g (3.5 oz)

  • Energy 4 kJ (0.96 kcal
  • Fat 0 g
  • Protein 0.2 thiamine (B1) (1%) 0.007 mg
  • Riboflavin (B2) (5%) 0.06 mg
  • Niacin (B3) (0%) 0.03 mg
  • Vitamin B6 (0%) 0.005 mg
  • Vitamin C (0%) 0.3 mg
  • Calcium (0%) 0 mg
  • Iron (0%) 0.02 mg
  • Magnesium (0%) 1 mg
  • Manganese (9%) 0.18 mg
  • Potassium (0%) 8 mg
  • Sodium (0%) 1 mg
  • Water 99.9 g
  • Caffeine 12 mg

Green Tea Side Effects 1

Green tea is mostly safe for adults when consumed accordingly, But some people may experience mild to moderate reactions especially people with the following conditions:

  • Stomach Problems
  • Iron Deficiency
  • People That Are Caffeine Intolerant
  • Pregnant Women
  • Nursing Mother’s
  • People that are anemic
  • Anxiety Disorders
  • Blood Clotting Disorders
  • Heart Conditions
  • Diabetic’s
  • People With Liver Disease
  • Osteoporosis

Studies show that people with these conditions should not consume green tea as it may interfere with treatments and medications. Regular consumption of green tea is safe however, there are reports that consuming high doses of green tea can cause liver toxicity in some people.

Green Tea Side Effects 2

Another commonly found reaction of green tea is caffeine intolerance, green tea contains caffeine and too much caffeine intake can lead to or trigger a variety of health problems, Some people have a natural low tolerance for caffeine, which causes symptoms even when consuming small amounts

Possible Symptoms Of Caffeine Intolerance

  • A headache
  • Nervousness
  • Sleep problems
  • Vomiting
  • Diarrhea
  • Irritability
  • Irregular heartbeat
  • Tremor
  • Heartburn
  • Dizziness
  • Ringing in the ears
  • Convulsions
  • Confusion
  • ringing in the ears

Although green tea has less caffeine than coffee or other types of tea, it still contains a considerate amount, therefore it is advisable to consume no more than 2-3 cups per day to be on the safe side.

Precautions And Warnings

  • Drinking very high doses of green tea is unsafe and can be fatal. The fatal dose of caffeine in green tea is estimated to be 10-14 grams (150-200 mg per kilogram). Serious toxicity can occur at lower doses.
  • Green tea is possibly safe for children when consumed in amounts commonly found in foods and beverages.
  • If you are pregnant or breastfeeding, only drink green tea in small amounts – about 2 cups per day.
  • A prolonged intake of green tea may make anemia worse.
  • The caffeine in green tea might make anxiety worse.
  • Caffeine in green tea might increase the risk of bleeding. Don’t drink green tea if you have a bleeding disorder.
  • Caffeine in green tea might cause an irregular heartbeat.
  • Caffeine in green tea might affect blood sugar control. If you drink green tea and have diabetes, monitor your blood sugar carefully.
  • Green tea contains caffeine. The caffeine in green tea, especially when taken in large amounts, can worsen diarrhea.
  • The caffeine in green tea might increase blood pressure in people with high blood pressure. However, this does not seem to occur in people who regularly drink green tea or other products that contain caffeine.
  • Green tea extract supplements have been linked to several cases of liver damage. Green tea extracts might make liver disease worse.


There you have it! 25 green tea side effects worth knowing to help you make better decisions on how to use this tea. If you liked this post, please share it and also follow us on Pinterest for more helpful tips.