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Green tea contains nutrients and antioxidants that provide many health benefits – from preventing cancer to improving brain function. Read this article to learn all about this nutritional drink.


Green tea contains polyphenols and catechins , which are micronutrients found naturally in our foods that can act as antioxidants.

Epigallocatechin gallate (EGCG) is the main polyphenol found in green tea and is known to have many beneficial effects on human health. The polyphenols can reduce the formation of free radicals, which play a role in diseases. This protects cells and molecules from damage. There are also minerals found in green tea that are important for health (R).

L-theanine is also found in green tea, and it is especially good for the brain.

Because there are no known health risks associated with green tea and no toxic level, green tea is a great way to help you become a healthier person (R).

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  • Antioxidants found in green tea can help prevent cancer
  • EGCG promotes brain health and defends against Parkinson’s and Alzheimer’s Disease
  • EGCG protects the heart
  • It protects against inflammation
  • Drinking green tea can help you lose weight


  • The caffeine found in green tea can lead to anxiety, heart rate problems, etc. if you drink too much
  • It might lower testosterone levels

Health Benefits of Green Tea

1) Antioxidants Found in Green Tea Can Lower Your Cancer Risk


Oxidative damage is known to cause various cancers in the body, so the many antioxidants found in green tea help lower your risk (R).

Many studies have been done on the antioxidant properties of green tea and it has been shown that green tea lowers the risk of breast, prostate, and colon cancer in humans (R, R, R).

The polyphenols found in green tea prevents cancer from growing by regulating cancer cell growth, survival, and metastasis. It affects the cancer cells at the DNA, RNA, and protein levels (R).

2) Green Tea Promotes Brain Health

The EGCG, caffeine, and L-theanine all work to improve brain function and health.

The amount of caffeine found in green tea is enough to help improve memory and reaction time. It also increases the amount of dopamine and norepinephrine in the brain (R).  

EGCG and L-theanine both increase memory and attention in patients with mild brain damage (R).

L-theanine also has anti-anxiety effects and can help you calm down (R).

On the other hand, EGCG was proven to reduce fatigue (R).  It can refresh and relax your brain (R). 

The polyphenols found in the brain also protects neurons and help protect against dementia, Alzheimer’s, and Parkinson’s disease (R).  

Green tea also reduced depressive symptoms and increased reward learning (R).

3) Green Tea Helps You Lose Weight


Green tea can help you lose weight in many ways.

It has been shown to increase your metabolism and help burn more fat (R).

Green tea suppresses appetite and leads to less energy consumption (R).

Green tea also interacts with other compounds that burn fat as well as adrenaline to increase the body’s metabolic rate (R).

EGCG suppresses an enzyme that breaks down norepinephrine, so this increases the amount of norepinephrine in the body. This hormone signals for more fat cells to be broken down, which can now be used as energy (R).

In addition to these properties, green tea can increase your endurance. The exhaust time for patients that drink green tea was extended. This means that you can exercise for a longer time and be able to lose more weight (R). 

Consumption of green tea also decreases carbohydrate consumption as well as block fat absorption (R).

In a study done on overweight and obese women, green tea consumption resulted in more weight loss (R).

4) EGCG Reduces Heart Disease Risk

Polyphenols found in green tea can reduce cholesterol, which is a main factor of heart disease (R).

Green tea also lowers blood pressure by increasing blood flow in the body (R).

5) Green Tea Lowers Risk of Diabetes

Catechins in green tea can help reduce your risk for Type II Diabetes by improving insulin sensitivity (R).

This then lowers blood glucose levels (R).

6) Green Tea Fights Against Bacterial Infections

Green tea acts as an antimicrobial agent. Its properties can reduce bacteria spores in the body (R).

EGCG damages bacterial membrane and fights against infections (R).

Mouthwash with green tea in it also reduced plaque and gingivitis (R).  

7) EGCG Has Anti-Inflammatory Effects

Polyphenols found in green tea helped prevent inflammation due to UV rays (R).   

EGCG also prevents and treats inflammation due to rheumatoid arthritis (R).

8) EGCG Improves Liver Health

Polyphenols in green tea can help improve liver health. It lowers lipid levels in the body and reduces the risk for non-alcoholic fatty liver disease (R).

9) EGCG Helps Skin


EGCG have anti-wrinkle effects and also reduced redness in skin (R).

10) EGCG Prevents Baldness

EGCG helps prevent baldness. The polyphenols in green tea can stimulate human hair growth (R).

11) EGCG Promotes Dental Health

EGCG helps oral defense mechanisms and can prevent gingivitis. It provides additional protection against oxidative stress in the mouth (R).

The polyphenol also helps enhance the activity of dental adhesives (R).

12) EGCG Prevents Osteoporosis

EGCG  promotes osteoclast and osteoblast growth in bone cells. EGCG can be used in stem cell research to help prevent osteoporosis (R).

13) Green Tea Can Help You Live Longer


Polyphenols in green tea protect telomeres from damage. Telomere damage can affect your biological age and increase disease risk. Thus, polyphenols can help prevent aging (R, R).

Finally, all of the benefits that green tea and EGCG offers will make your life healthier, which can also boost your longevity (R).


Green tea increases N-acetyl aspartate (R), which can help with intelligence.

Green tea may lower thyroid function (R).

Buy EGCG Supplements/ Green Tea


  • EGCG, quercetin, and carvedilol, have potent antioxidant effects as evidenced by reduction of MDA contents and resumption of SOD activities. EGCG, quercetin, and carvedilol could prevent telomere attrition and telomere repeat-binding factor 2 (TRF(2)) loss remarkably, whereas captopril and losartan had no effect on oxidative stress and telomere signal (R).
  • Addition of green tea and black tea infusions (50 μl/ml) and EGCG (50 μM) to saliva, resulted in a sharp rise of OPO activity +280% (p = 0.009), 54% (p = 0.04) and 42% (p = 0.009), respectively. The elevation of OPO activity due to addition of green tea and EGCG was in a dose dependent manner: r = 0.91 (p = 0.001) and r = 0.637 (p = 0.019), respectively (R).
  • When, however, the analysis was stratified using the median of the week-0 values, the decrease at week 24 in waist circumference, systolic blood pressure, and low-density lipoprotein cholesterol in the catechin group was significantly greater than that in the control group for the above-median category (R).
  • Polyphenols up- or down-regulated activity of a number of key enzymes, including mitogen-activated protein kinases and protein kinase C, and increased or decreased protein/mRNA levels, including that of cyclins, oncogenes, and tumor suppressor genes (R).
  • EGCG with caffeine insignificantly raised EE and fat oxidation v. caffeine-only and placebo (EE 5.71 (SE 0.12) v. 5.68 (SE 0.14) v. 5.59 (SE 0.13) MJ/12.5 h, respectively; fat oxidation 84.8 (SE 5.2) v. 80.7 (SE 4.7) v. 76.8 (SE 4.0) g/12.5 h) (R).
  • LGNC-07 led to improvements in memory by marginally increasing delayed recognition in the Rey-Kim memory test (P = .0572) (R).
  • Based on a reduced proportion of body fat as estimated by bioimpedance measurement, increased liver-to-spleen CT attenuation ratio, decreased serum ALT levels and reduced urinary 8-isoprostane excretion, we concluded that 12 weeks of 700 ml per day of green tea containing >1 g catechin improved liver fat content and inflammation by reducing oxidative stress in patients with NAFLD (R).

Interactions With Other Nutrients

  • Fish Oil and Fish: Fish oil worked together with catechins in green tea to increase fat and glucose metabolism while nutrients found in fish helped lower blood pressure (R).
  • Ubiquinone: This supplement helps increase the effectiveness of EGCG’s antioxidant properties (R).
  • Curcumin: Curcumin works together with EGCG to reduce tumor progression in colon cells (R).
  • Vitamin C: This vitamin works with green tea to reduce cancer risk (R).
  • Capsicum vanilloids: Found in hot peppers, capsicum vanilloids help fight against cancer by increasing cell killing ability (R).  
  • Vitamin E: Coupled with Vitamin E, green tea polyphenols improved exercise capacity, lowered glucose levels, and reduced body weight (R).

Side Effects

If you drink too much, the caffeine found in green tea can lead to anxiety, heart rate problems, etc. L-theanine found in green tea can also cause dizziness, headaches, and digestive problems (RR).

In rats, green tea consumption lowered testosterone levels by 20% and sperm count by 2%. This might affect reproduction (R).


Do not exceed 250mg of EGCG per a day, as more has been associated with live issues.

FDA Compliance

The information on this website has not been evaluated by the Food & Drug Administration or any other medical body. We do not aim to diagnose, treat, cure or prevent any illness or disease. Information is shared for educational purposes only. You must consult your doctor before acting on any content on this website, especially if you are pregnant, nursing, taking medication, or have a medical condition.


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  • Dirk

    Lightly caffeinated may be more effective.

  • odell65

    I don’t agree: [huffington post]

    Friendly, Lue

  • MKW

    Does decaffeination reduce the effectiveness of green tea? I can’t tolerate even tiny amounts of caffeine, but would like to try organic decaf green tea.

  • Dirk

    Too much is anti-thyroid. It has also been proven beneficial to those with CLL.

  • Jake

    Would green tea have negative effects for someone with very little COMT?

    1. Joseph M. Cohen


      1. Alex

        But it would also potentially be extra beneficial in some other ways right?

        I read the study that showed that women with low COMT (AA) benefited more from tea consumption and had lower cancer risk.

        I understand that overdoing it can cause excess catecholamines because you hamper COMT even more, but it seems to me like low COMT individuals benefits the most from the health effects of catechins.

        Would love to hear your input Joseph!

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