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.

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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.

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 ( 1 ).

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.

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

Green tea extract is rich in antioxidants called catechins, which have been shown to increase antioxidant capacity and protect against oxidative stress.

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.

For example, in one study, 35 people with obesity took 870 milligrams (mg) of green tea extract for 8 weeks. Their blood antioxidant capacity increased from 1.2 to 2.5 micromoles per liter (μmol/L), on average ( 4 ).

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 ( 3 , 4 , 5 ).

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.

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

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

The catechins in green tea may help reduce blood pressure and improve blood fat levels, which promotes heart health.

Given that high blood pressure and high blood fat levels are risk factors of heart disease, regulating them can help promote heart health.

An older study involving 33 people between ages 21 and 71 years old with no lipid imbalances 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% ( 9 ).

Additionally, they experienced significant reductions in blood fat levels, including lower triglycerides and both total and LDL (bad) cholesterol ( 8 ).

In one 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 ( 8 ).

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 ( 8 , 9 , 10 , 11 ).

Oxidative stress increases fat buildup in your blood, which promotes inflammation in your arteries and leads to high blood pressure ( 6 , 7 ).

Green tea extract has been shown to have a positive effect on brain health and memory, and it may help protect against brain diseases.

The green tea extract group showed an increase in brain function and improved task performance, compared with the placebo group ( 17 ).

In a 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.

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

Green tea extract can also decrease the action of heavy metals like iron and copper, both of which can damage brain cells ( 15 , 16 ).

This protection can help reduce brain damage that could lead to mental decline and brain diseases like Parkinson&#;s, Alzheimer&#;s, and dementia ( 12 , 13 , 14 ).

The antioxidants in green tea extract, especially EGCG, have been shown to protect brain cells from oxidative stress ( 12 ).

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 (18, 19, 20, 21).

Both catechins and caffeine have been shown to assist in weight loss by regulating the hormones that can enhance thermogenesis (19, 22, 23). 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 (23, 24, 25).

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 (19).

However, results are mixed.

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In another well-designed study, 60 Caucasian adults took 560 mg of green tea extract along with between 280 and 450 mg of caffeine or a placebo daily for 12 weeks. This study found no significant effect on resting energy expenditure or body composition (26).

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 (27).

In fact, one study determined that green tea catechins don&#;t show any significant effect on energy expenditure when tested against caffeine alone (18).

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 (20).

In one 12-week study, 115 women with central obesity (higher concentration of fat in the abdominal area) took 856.8 mg of green tea extract or placebo daily. Those taking the green tea extract experienced significant weight loss, along with decreases in BMI, waist circumference, and cholesterol levels, compared with participants who were given a placebo (28).

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 (29, 30).

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

Summary

Green tea extract may aid weight loss by increasing the number of calories your body burns through a process called thermogenesis. However, the effect is modest, and it&#;s unclear whether green tea catechins or caffeine are responsible. High doses of green tea extract are toxic and may lead to serious liver damage.

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Green Tea Extract

Botanical name(s):

Camellia sinensis. Family: Theaceae

Other name(s):

green tea, Chinese tea, green sencha tea, Japanese tea, Yame tea

General description

Green tea comes from the plant Camellia sinensis. Black tea, green tea, and oolong tea are all made from the same plant but are prepared using different processing methods.

Green tea extract contains polyphenols. These include the most active type, epigallocatechin gallate. Green tea and oolong tea have the highest levels of polyphenols. This means they have the most health benefits. The fermentation and processing to make black tea decrease the polyphenols. It does this by converting them to theaflavins and thearubigins. All of the teas have catechins and tannins in different amounts.

Other significant parts of tea include caffeine, theobromine, and theophylline. The polyphenols of green tea are strong antioxidants.

Tea is the second-most popular drink in the world. People drink it for its flavor and stimulant effect.

Demonstrated uses

Studies suggest that the polyphenols in tea, especially green tea, may help reduce the risk for some cancers. Or it may slow the growth of certain types of cancers. Studies done in humans have shown mixed results.

Tea is used as a stimulant drink. The methylxanthines, specifically caffeine, increase alertness. It&#;s also a mild stimulant.

Green tea extract ointment has been shown to cure external genital and perianal warts. This product is approved by the FDA. It&#;s available by prescription.

Claims

There may be benefits that have not yet been proven through research.

Green tea may be a mild diuretic. It may help lower cholesterol.

Suggested dosage

Green tea extract comes in oral capsules. It&#;s available in different strengths. Follow the instructions on the package for the correct dose.

Green tea as loose, dried leaves or in tea bags should be steeped in hot water for a short time. Make sure the water isn&#;t scalding. This is done to preserve important chemicals in the leaf.

Side effects

Green tea can cause side effects due to caffeine. These can include anxiety, tremors, irritability, and sleeping problems. This is more likely if you&#;re sensitive to caffeine or take large doses. Side effects are less common with green tea than with other drinks that have caffeine. This is because the leaves are steeped for a shorter time.

The fluoride content of green tea may help prevent tooth decay. But the tea also contains tannic acid. This can stain teeth.

Green tea extracts may cause liver problems. Symptoms can include yellowing of your skin or the whites of your eyes, nausea, and stomach pain. If you have these symptoms, stop using green tea and see your healthcare provider right away. The negative effects of green tea extract on the liver may depend on how much green tea extract you consume each day.

Interactions

Green tea may change the effects of medicines such as nadolol, a beta-blocker used for high blood pressure and heart problems. It may keep nadolol from lowering your blood pressure as much as it should. Green tea contains small amounts of vitamin K. This means it may decrease how well blood thinner medicines work. Since green tea acts as a mild stimulant, you shouldn&#;t use it with other stimulants. It may change the effects of other medicines.

Talk with your healthcare provider about the use of green tea. Women who are pregnant or breastfeeding should talk to their healthcare providers before taking any herbal medicines.

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