10 Benefits of Green Tea Extract

Green tea is one of the most commonly consumed teas in the world.

Green tea extract is its concentrated form, with just one capsule containing the same amount of active ingredients as an average cup of green tea.

Like green tea, green tea extract is a great source of antioxidants. These have been credited with a range of health benefits — from promoting heart, liver, and brain health to improving your skin and even reducing the risk of cancer (1Trusted Source).

What’s more, many studies have looked at the ability of green tea extract to aid weight loss. In fact, many weight loss products list it as a key ingredient.

Despite these benefits, it’s important to know that green tea extract can also be toxic when taken in excess, so always talk with a health professional if you’re interested in taking these supplements.

This article explores 10 science-based benefits of green tea extract.

1. High in antioxidants

The health benefits of green tea extract are mostly due to its high antioxidant content.

Antioxidants can help reduce oxidative stress in your body by fighting cell damage caused by molecules called free radicals. This cell damage is associated with aging and several diseases (2Trusted Source).

Polyphenol antioxidants called catechins make up the majority of green tea extract’s antioxidant content. Among the catechins in green tea, epigallocatechin gallate (EGCG) is the most researched and thought to provide the most health benefits.

Studies have shown that green tea extract increases your body’s antioxidant capacity (the activity of your body’s own antioxidant enzymes) and protects against oxidative stress. This, in turn, may prevent associated health concerns (3Trusted Source, 4Trusted Source, 5Trusted Source, 6Trusted Source).

For example, in one 2012 study, 35 people with obesity took 870 mg of green tea extract for 8 weeks. Their blood antioxidant capacity increased from 1.2 to 2.5 μmol/L, on average (5Trusted Source).

It should be noted that the participants in this small study were taking green tea extract in an amount considered to be in the toxic range. Because of this, it’s unclear whether green tea extract would have the same effect if taken in smaller, safer doses.

2. May promote heart health

Oxidative stress increases fat buildup in your blood, which promotes inflammation in your arteries and leads to high blood pressure (7Trusted Source, 8Trusted Source).

The antioxidants in green tea extract can decrease inflammation and help reduce blood pressure. They can also inhibit fat absorption in cells, helping reduce blood fat levels (8Trusted Source, 9Trusted Source, 10Trusted Source, 11Trusted Source, 12Trusted Source).

In one 2012 study, 56 people with obesity and high blood pressure took 379 mg of green tea extract daily for 3 months. They showed a significant decrease in blood pressure, compared with the placebo group (9Trusted Source).

Additionally, they experienced significant reductions in blood fat levels, including lower triglycerides and both total and LDL (bad) cholesterol (9Trusted Source).

An older study in 33 people with no underlying health conditions found that taking 250 mg of green tea extract daily for 8 weeks reduced total cholesterol by 3.9% and LDL (bad) cholesterol by 4.5% (10Trusted Source).

Given that high blood pressure and high blood fat levels are risk factors for heart diseases, regulating them can promote heart health.

3. Good for the brain

The antioxidants in green tea extract, especially EGCG, have been shown to protect brain cells from oxidative stress (13Trusted Source).

This protection can help reduce brain damage that could lead to mental decline and brain diseases like Parkinson’s, Alzheimer’s, and dementia (13Trusted Source, 14Trusted Source, 15Trusted Source).

Green tea extract can also decrease the action of heavy metals like iron and copper, both of which can damage brain cells (16Trusted Source, 17Trusted Source).

It’s been shown to help memory as well, by enhancing the connection between different parts of your brain.

In a 2014 study, 12 people drank a soft drink containing either 27.5 grams of green tea extract or a placebo. Then, while the participants worked on memory tests, brain images were obtained to assess brain function.

The green tea extract group showed an increase in brain function and improved task performance, compared with the placebo group (18Trusted Source).

4. Can help with weight loss

Green tea extract is rich in catechins, and it contains a decent amount of caffeine. Interestingly, it seems that this combination of ingredients is responsible for green tea extract’s modest weight loss properties (19Trusted Source, 20Trusted Source, 21Trusted Source, 22Trusted Source).

Both catechins and caffeine have been shown to assist in weight loss by regulating the hormones that can enhance thermogenesis (20Trusted Source, 23Trusted Source, 24Trusted Source). Thermogenesis is the process by which your body burns calories to digest food and produce heat.

Green tea has been shown to boost this process by making your body more effective at burning calories, which can lead to weight loss (24Trusted Source, 25Trusted Source, 26Trusted Source).

In one older study, 14 people took a capsule containing a mixture of caffeine, EGCG from green tea, and guarana extract before each meal. It then examined the effect on calorie burning and found that the participants burned 179 more calories, on average, in the following 24 hours (20Trusted Source).

However, results are mixed.

In another well-designed study, 60 adults took 56 mg of green tea extract along with either 28 to 45 mg of caffeine or a placebo daily for 12 weeks. This study found no significant effect on resting energy expenditure or body composition (27Trusted Source).

And, since caffeine is known to stimulate energy expenditure, the modest weight loss effects of green tea extract may be due — at least in part — to the caffeine itself (28Trusted Source).

In fact, one study determined that green tea catechins don’t show any significant effect on energy expenditure when tested against caffeine alone (19Trusted Source).

Plus, the amount of caffeine you typically consume may affect your body’s response to green tea extract.

Those who regularly consume high amounts of caffeine (greater than 300 mg per day, or about 3 cups of coffee) may not experience as great an effect from green tea extract (21Trusted Source).

In one 12-week study, 115 women with overweight took 856 mg of green tea extract or placebo daily. While those taking the green tea extract lost 2.4 pounds on average, people taking a placebo actually lost more weight and experienced greater decrease in waist and hip circumference (29Trusted Source).

It should be noted that the dosage of green tea extract used in this study is in the toxic range for daily catechin intake. People taking high doses of green tea catechins should monitor their liver enzymes to avoid liver damage or acute liver failure (30Trusted Source, 31Trusted Source).

While a cup of green tea contains 50 to 100 mg green tea catechins and 30 to 40 mg of caffeine, studies of green tea extract often contain 375 mg or more of green tea catechins and up to 600 mg caffeine.

Those with sensitivity to caffeine or cardiovascular issues should consider this before taking green tea extract for weight loss. It’s always good to speak with a healthcare professional so they can help you decide whether green tea extract is right for you.

5. Might benefit liver function

The catechins in green tea extract may also help reduce inflammation caused by some liver diseases, such as nonalcoholic fatty liver disease (NAFLD) (32Trusted Source, 33Trusted Source).

One study gave 80 participants with NAFLD either 500 mg of green tea extract or a placebo daily for 90 days (32Trusted Source).

The green tea extract group showed significant reductions in liver enzyme levels, which is an indication of improved liver health (32Trusted Source).

Similarly, 17 patients with NAFLD took 700 ml of green tea, which contained at least 1 gram of catechins, daily for 12 weeks. They had significant decreases in liver fat content, inflammation, and oxidative stress (33Trusted Source).

However, as mentioned above, it’s important to have your liver functions tested regularly, because excessive amounts of green tea catechins have been shown to be harmful to the liver (31Trusted Source). Talk with a healthcare professional to determine the right dosage for you.

6. May reduce the risk of cancer

The maintenance of your body’s tissues and organs is characterized by cell death and regrowth. Specialized cells known as stem cells produce new cells to replace those that die. This process keeps cells active and healthy.

When this balance is disrupted, cancer can occur. This is when your body starts producing dysfunctional cells, and cells don’t die when they should.

The antioxidants in green tea extract, especially EGCG, seem to have favorable effects on the balance of cell production and death (34Trusted Source, 35Trusted Source, 36Trusted Source, 37Trusted Source).

One small older study explored the effects of taking 600 mg of green tea catechins per day for a year on men at risk of developing prostate cancer.

It found that the likelihood of developing cancer was 3% for the green tea group, compared with 30% for the control group (38Trusted Source).

7. May be good for the skin

Whether taken as a supplement or applied to the skin, green tea extract has been shown to improve skin health (39Trusted Source).

A large review demonstrated that when applied to the skin, green tea extract can help treat a variety of skin concerns, such as dermatitis, rosacea, and warts. As a supplement, it has been shown to help with skin aging and acne (39Trusted Source, 40Trusted Source, 41Trusted Source).

For example, a study showed that consuming 1,500 mg of green tea extract daily for 4 weeks resulted in significant reductions in red skin bumps caused by acne (41Trusted Source).

Moreover, both supplements and the topical application of green tea extract seem to help prevent skin conditions like loss of skin elasticity, inflammation, premature aging, and cancer caused by exposure to UV rays (40Trusted Source, 42Trusted Source).

A study in 10 people revealed that applying a cream containing green tea extract to the skin for 60 days resulted in improved skin elasticity (43Trusted Source).

Additionally, a study showed that applying green tea extract to the skin reduced skin damage caused by sun exposure (40Trusted Source).

Interestingly enough, adding green tea extract to cosmetic products has been shown to benefit the skin by providing a moisturizing effect (44Trusted Source).

8. May benefit exercise performance and recovery

Green tea extract seems to be helpful in exercise, whether it’s by improving exercise performance or enhancing recovery.

While exercise has many health benefits, it’s known to produce oxidative stress and damage cells in the body. Antioxidants, like green tea catechins, can reduce cellular damage and delay muscle fatigue (45Trusted Source, 46Trusted Source).

In fact, a study in 35 men showed that green tea extract combined with strength training for 4 weeks enhanced the body’s antioxidant protection (47Trusted Source).

Additionally, 16 sprinters who took green tea extract for 4 weeks demonstrated increased protection against oxidative stress produced by repeated sprint bouts (48Trusted Source).

Green tea extract also seems to benefit exercise performance.

One study found that 14 men who consumed green tea extract for 4 weeks increased their running distance by 10.9% (49Trusted Source).

9. May help lower blood sugar

The catechins in green tea, especially EGCG, have been shown to enhance insulin sensitivity and regulate the production of blood sugar, both of which can lower blood sugar levels (50Trusted Source, 51Trusted Source).

A study gave 14 people with no underlying health conditions a sugary substance and either 1.5 grams of green tea or a placebo. The green tea group experienced better blood sugar tolerance after 30 minutes and continued to show better results, compared with the placebo group (52Trusted Source).

Another study showed that green tea extract improved insulin sensitivity in healthy young men by 13% (53Trusted Source).

Keep in mind that these studies (52Trusted Source, 53Trusted Source) were very small and that the participants had no underlying health conditions. Many people with diabetes, on the other hand, take medications that affect their liver and many have NAFLD, so they would need to monitor their liver enzymes.

If you have diabetes, you should speak to your doctor before taking these supplements.

An analysis of 17 studies concluded that green tea extract is useful in decreasing fasting blood sugar levels. It can also help lower levels of hemoglobin A1C, which is an indicator of blood sugar levels over the past 2–3 months (54Trusted Source).

10. Easy to add to your diet

Green tea extract is available in liquid, powder, and capsule forms. A wide selection can be found on Amazon.

The liquid extract can be diluted in water, while the powder can be mixed into smoothies. However, it has a strong taste.

The recommended dosage of green tea extract is between 250–500 mg per day. This amount can be obtained from 3–5 cups of green tea, or about 1.2 liters.

But it’s important to know that not all green tea extract supplements are created equal. Some supplements contain only dry green tea leaves, while others contain isolated forms of one or more catechins.

Because supplements are not regulated by the FDA to ensure safety, purity, or verification of contents, you should only purchase supplements that have been analyzed by an independent lab to verify purity and content.

The catechin most closely linked to the health benefits of green tea extract is EGCG, so you’ll want to make sure that the supplement you are consuming contains it.

Finally, it’s best to take green tea extract with foods. Both exceeding the recommended dose and taking it on an empty stomach may cause serious liver damage (31Trusted Source, 55Trusted Source).

Thanks to its high antioxidant content, green tea extract has been shown to help improve health and body composition.

Many studies have shown that green tea extract can promote weight loss, blood sugar regulation, disease prevention, and exercise recovery.

It can also help keep your skin and liver healthy, reduce blood fat levels, regulate blood pressure, and improve brain health.

It can be consumed in capsule, liquid, or powder form. The recommended dose is 250–500 mg a day, and it’s best taken with food. Amounts above this may be toxic. Plus, people with diabetes or those taking certain medications should speak with a healthcare professional before taking any amount of green tea extract.

Whether you want to improve your general health or decrease your risk of disease, green tea extract is an easy way to add health-boosting antioxidants to your diet.