April 18, 2024

Green Tea Extract: Four Proven Health Benefits

Written by our expert


Avanthika Nityanand

M.Sc Human Genetics, B.Sc Plant Biology & Plant Biotechnology

Medically Reviewed by

Col (Dr) Surendra Ramamurthy

Col (Dr) Surendra Ramamurthy

Healthcare Technology & Digital Health Advisor and Military Veteran (Doctor)

Green Tea Extract: Four Proven Health Benefits
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Green tea, made from the leaves of the Camellia sinensis plant, is celebrated not only for its delicate flavor but also for its extensive health benefits.

Unlike black tea, green tea undergoes minimal oxidation during processing, which helps preserve its rich content of antioxidants and polyphenols.

These compounds are pivotal in providing the therapeutic benefits that green tea is renowned for, including improved heart health, enhanced metabolic rate, and lower risk of chronic diseases.

This article delves into these benefits, supported by scientific research, to uncover how daily consumption of green tea can potentially transform your health.

What is Green Tea Extract?

Green tea extract is an herbal derivative obtained from green tea leaves. It is rich in antioxidants, primarily catechins, of which epigallocatechin gallate (EGCG) is the most abundant and studied.

Due to its numerous health benefits, the extract is commonly used in supplements, health foods, and cosmetic products.

Key Components

The major bioactive compounds in green tea extract include:

  • Catechins are flavonoids with potent antioxidant properties, with EGCG being the most notable.
  • Caffeine: While less concentrated than in coffee, caffeine in green tea extract contributes to its energizing effects.
  • Theanine: An amino acid that provides a unique umami flavor and can promote relaxation and support brain function.

May Improve Cardiovascular Health

Cholesterol and Blood Pressure

Green tea significantly impacts cardiovascular health by improving cholesterol levels and lowering blood pressure.

Studies have shown that it reduces low-density lipoprotein (LDL) cholesterol while enhancing high-density lipoprotein (HDL) cholesterol. This balance is crucial in preventing the formation of plaques in arterial walls, a primary cause of atherosclerosis and heart attacks.

In a 2012 double-blind placebo-controlled study evaluating the effects of EGCG (Epigallocatechin Gallate), administered as PolyPhenon-E, post-menopausal women received daily doses of either 400mg or 800mg for two months. Results revealed significant reductions in LDL cholesterol levels. [ref]

Furthermore, green tea's anti-inflammatory properties help reduce blood pressure, a critical factor in cardiovascular risk.

Regular consumption has been associated with a reduced risk of stroke and heart disease, illustrating green tea's role as a beneficial drink for heart health.

May Have Antioxidative Benefits

Cellular Protection and Systemic Effects

The polyphenols in green tea, including catechins like EGCG (Epigallocatechin Gallate), are potent antioxidants.

They protect cells from oxidative stress induced by free radicals and unstable molecules that can cause cell damage and are linked to multiple diseases, including cancer and heart disease. By neutralizing these radicals, green tea's antioxidants help preserve cellular integrity and mitigate aging processes.

In a 2010 8-week randomized controlled trial targeting obese individuals with metabolic syndrome (average BMI of 36.1), participants were administered green tea either as drinks or capsules, delivering approximately 870-928 mg of catechins, including 440-460 mg of EGCG daily. Results revealed significant decreases in oxidation biomarkers, suggesting improved antioxidant status. [ref]

The systemic effects of these antioxidants are profound, offering protection against chronic diseases and decreasing the overall burden of aging on the body.

May Help In Weight Management

Fat Reduction and Glucose Regulation

Green tea accelerates metabolic rate and enhances fat oxidation, thanks to its combination of caffeine and catechins.

This effect not only aids in weight management but also improves physical performance by mobilizing fatty acids from fat tissues and making them available for energy production.

In a 2008 double-blind, randomized, controlled trial, the study involved one ingesting green tea with 576 mg of catechins and a control group ingesting green tea with 75 mg of catechins daily. Results from 40 participants indicated significant improvements in the catechin group compared to the control group in waist circumference, systolic blood pressure, and LDL cholesterol levels among subjects with above-median baseline values. [ref]

Additionally, green tea's influence on blood sugar levels is significant. It helps moderate glucose levels after meals, preventing high insulin spikes and the subsequent fat storage.

These properties make it an excellent supplement for those looking to lose weight or manage diabetes, as it enhances metabolic health in several dimensions.

May Improve Cognitive Function

Neuroprotection and Cognitive Enhancement

Green tea improves cognitive health by improving brain function and mood. Its catechins have neuroprotective properties, which can enhance neuronal functioning and slow down the brain's aging process, potentially lowering the risk of neurodegenerative diseases such as Alzheimer’s and Parkinson’s.

Furthermore, green tea contains L-theanine, an amino acid that works synergistically with caffeine to improve brain function, reduce anxiety, and enhance mood. This makes green tea a unique beverage that can boost mental clarity and focus without the jitteriness associated with coffee.


In conclusion, green tea offers many health benefits, making it a valuable addition to a healthy lifestyle.

Its medicinal properties, including cardiovascular protection, antioxidant benefits, metabolic rate enhancement, and cancer prevention, provide substantial empirical support for its use as a health-promoting beverage.

Regular consumption of green tea can lead to significant improvements in health and well-being, backed by extensive research and centuries of anecdotal evidence. Embracing green tea as part of your daily routine could be a simple yet effective way to enhance your overall health.

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