Side Effects From Green Tea Leaf Extract Capsules

Updated February 21, 2017

Green tea leaf extract is made from the plant scientifically known as camellia sinensis. The Chinese first implemented green tea's medicinal properties and green tea extract capsules are used today to promote weight loss and cardiovascular health, to help with digestive problems and to help lower blood pressure and sugar levels. The side effects are rare, and most come from the caffeine levels found in green tea. Always follow dosage instructions and consult your doctor if you have any concerns about pre-existing conditions. Many side effects can be avoided by cutting the dosage in half.

Increased Heart Rate

Green tea extract capsules, especially if taken in too high of a dose, can cause a rapid or even irregular heart rate. Deal with this immediately by relaxing. Sit still, close your eyes, put on calming music, breathe deeply or take a hot bath with a calming aroma such as lavender. Irregular hear rates should be reported to your doctor.


Again, in too high of a dose or if you are sensitive to caffeine, green tea extract capsules can cause feelings of anxiety, restlessness and overactive thinking. In turn, this can also cause sleeplessness. Calm your nerves by relaxing yourself and by drinking plenty of water to hydrate and cleanse your system. A glass of wine can also help slow brain activity.


Dizziness and feeling lightheaded can also result from the caffeine in green tea extract capsules and is more likely to occur if you have taken the extract on an empty stomach. Diminish these feeling by eating a healthy, hearty meal, even if the lightheadedness has curbed your appetite.

Upset Stomach

The caffeine in green tea extract capsules can cause upset stomach as well as diarrhoea, especially in those with a highly sensitive stomach. To relieve diarrhoea due to green tea, take an anti-diarrhoea medication.

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About the Author

Mason Howard is an artist and writer in Minneapolis. Howard's work has been published in the "Creative Quarterly Journal of Art & Design" and "New American Paintings." He has also written for art exhibition catalogs and publications. Howard's recent writing includes covering popular culture, home improvement, cooking, health and fitness. He received his Master of Fine Arts from the University of Minnesota.