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What Is Green Tea Extract

Reactive Oxygen Species Oxidative Stress And Antioxidants

What is Green Tea Extract?

Any shift in the equilibrium, which may happen due to a reduction of antioxidants inside the system or due to an increase in ROS as a result of immune-related processes, will lead to oxidative stress . Prolonged stress and aging may play a major role in reducing the efficiency of endogenous antioxidants against oxidative stress . ROS promote peroxidation of the lipids in the cell membranes, along with altering the structure and function of different enzymes and promoting carbohydrate oxidation . Inside the brain, this could lead to neurological, age-associated diseases like Parkinsonâs disease and Alzheimerâs disease . In this regard, exogenous antioxidants may be better at modulating excess levels of ROS inside a host. Identification of natural sources of antioxidants, mainly of plant origin, may have several advantages over focusing on chemical compounds. Natural sources can be taken as food additives, which could hinder the chain reactions of oxidation, thereby inhibiting the oxidation process .

However, proper care should be taken to avoid excess use of antioxidants, as it could be harmful. Vitamins A, E, and C and β-carotene in high doses have not been shown to extend health benefits, but rather lead to hypervitaminosis and intoxication . Case studies have been reported in the United States regarding toxic reactions after consuming vitamin A at a dose of approximately 100,000 IU/day. Similar results have also been reported for vitamin E and ascorbic acid .

Green Tea Can Help You Reduce Your Sugar Intake

Green tea is a healthy choice for those worried about added sugars, because it naturally contains zero grams of sugar. Compared to soda and fruit juice, which both contain a lot of sugar, green tea is the healthier choice. If you are accustomed to sugary beverages, it may take some time to adjust to the more astringent flavor of green tea. One good way to reap the benefits of green tea is to mix a tablespoon or two of matcha green tea powder into your smoothies until you get used to drinking green tea on its own.

Does Green Tea Prevent Cancer

Compounds called catechins are often credited for green teas cancer-fighting potential. These antioxidants have the ability to block the action of molecules called free radicals, which can cause changes in healthy cells that sometimes lead to cancer. But theres no solid proof yet that the catechins in green tea help to prevent cancer in humans, despite some promising studies in test tubes and animals.

In 2009 the Cochrane Library published a review of 51 studies that included a total of more than 1.6 million participants. Each study investigated whether consuming green tea reduced the risk of developing specific types of cancer, including those of the breast, colon, oral cavity, liver, pancreas, and prostate.

The results were conflicting, says lead author Katja Boehm, PhD, a health psychologist at Private University Witten/Herdecke in Germany. After scrutinizing the data, Boehm says, the evidence of a benefit wasnt strong enough to recommend using green tea to protect against cancer.

In a 2020 update to that review, the authors concluded that the evidence for a beneficial effect against cancer remains limited, with inconsistent results between studies.

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The Green Tea Extract Side Effects

Some of the potential side effects might include:

  • Sleep problems. More than 10% of adults in the US have chronic insomnia. If youre one of them, you should avoid taking products that contain caffeine before going to bed.
  • Jitters and nervousness. These may also occur due to caffeine intake.
  • Stomach cramps. This usually happens if you take the pills on an empty stomach.

Is Green Tea Extract The Same As Green Tea

Green Tea Standardized Extract, 600 mg, 120 Capsules x 2 ...

No. Green tea extract, EGCG, and other green tea supplements are not the same as green tea.

The most apparent differences, of course, are that supplements are portable and may be more convenient, yet lack the renowned flavors and other nuances that make drinking tea a popular pastime worldwide.

And pure EGCG or epigallocatechin-3-gallate, by definition, lacks other beneficial catechins and flavonoids from green tea, like epicatechin , epicatechin-3-gallate , epigallocatechin , gallic acid, and tannins.

Beyond the clear-cut distinctions, though, heres what research tells us about the tradeoffs of taking green tea extract as opposed to drinking tea.

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How Does Green Tea Extract Work

EGCG has a direct effect on increasing fat oxidation, the bodys ability to use body fat for energy and boosts your ability to burn more calories at rest through promoting thermogenesis. In other words, EGCG boosts your metabolic rate. Research indicates, that by combining green tea extract with moderate-intense training, fat oxidation will increase from 17-20%, in addition to the increase of fat-oxidation from exercise alone. Therefore, green tea extract can help you lose weight by utilizing your body fat for fuel and helping you burn more calories.

The exact mechanism of action of EGCG is not directly known. However, EGCG is thought to have a direct effect on the sympathetic nervous system stimulation lipolysis, thus increasing fat oxidation.

Medications For Diabetes Interacts With Green Tea

Green tea contains caffeine. Caffeine might increase blood sugar. Diabetes medications are used to lower blood sugar. Taking some medications for diabetes along with caffeine might decrease the effectiveness of diabetes medications. Monitor your blood sugar closely. The dose of your diabetes medication might need to be changed.Some medications used for diabetes include glimepiride , glyburide , insulin, pioglitazone , rosiglitazone , chlorpropamide , glipizide , tolbutamide , and others.

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What Is Green Tea Extract Or Egcg

Green tea extract is a decaffeinated mixture of polyphenols from the Camellia sinensis tea plant .

In other words, green tea extract is a concentrated version of green tea without the caffeine content. As a dietary supplement, its available in capsule and powder form.

Most green tea extract comes from tea leaf scraps left over from tea processing. Commercial manufacturing techniques use hot water or solvents like alcohol or acetone for extraction followed by freeze-drying, spraying, or emulsification to ensure a predictable consistency.

In contrast to green tea extract, epigallocatechin gallate is a specific, individual catechin polyphenol found in Camellia sinensis. It also occurs in lower concentrations in many fruits, in nuts, and in cocoa.

Green tea contains around 7.3 grams of EGCG per 100 grams of dried tea leaves. Its the most abundant catechin in tea, accounting for nearly 60% of total catechin content in green tea.

Like green tea extract, EGCG is also available as a supplement and is made with a similar manufacturing process. EGCG used in supplements mainly comes from leftover green tea leaves, too.

Green Tea Dried Leaf Extract

Green Tea Extract Capsules What does Dr Oz say?
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Organika’s Green tea leaf extract is a great source of antioxidants. Ours is standardized to contain 50% EGCG, a polyphenol known to inhibit oxidation in the body. Each capsule is equivalent to 7-8 cups of green tea!

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  • Clean, all-natural formula
  • Standardized to contain 50% EGCG
  • Gluten free
  • Antioxidant for the maintenance of overall good health
  • Thermogenic stimulates metabolism and promotes healthy weight management
  • Potent source of epigallocatechin

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Green Tea Extract: What It Is

And furthermore is it a safe option?

The questions stem from mounting research that many food extracts used for medicinal purposes contain too much of a good thing. In most cases, many foods and herbs have specific health benefits, and many companies are trying to derive the health benefits from the food without the calories, the necessary prep time, or added liquid consumption.

Green Tea Extract, also called GTE, is no exception to this. There are companies that are drawing the health benefits out of the green tea so that they may be consumed in higher concentration in convenient pill form. This extract may either be presented in a capsule form that contains high amounts of powdered green tea or a liquid filled capsule that contains a hyper-concentrated form of tea.

Why this is a Bad Thing

As with a large number of things, the difference between something being medicinal and poisonous is in the overall dosage that is consumed. The differences between Green Tea and GTE are no exception.

The problem with these GTE supplements is that they do not have this built in safety feature build up can occur within the body since the liquid may not be present to help clear out any excess EGCG. This is doubly dangerous when you realize that most of the supplements on the market that are GTEs often contain approximately 500mg of EGCG per capsule.

Where does Green Tea extract come from?

A Better Alternative

Not convinced? Some people may argue the following:

The Conclusion

Health Benefits Of Green Tea Extracts And Matcha

Green tea extracts have a lot of health benefits for your body when consumed. One of such benefits is that it helps to slow them the aging process, by intensifying the bodys immunity to free radicals hence leaving your skin fresh and young.

Matcha has the same medical uses as green tea extracts, but this time in a higher dimension. Matcha can treat obesity, boost heart health, and lower blood sugar levels, among others, because it has 147 times more antioxidants than Green tea.

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Doctors Do Not Recommend Taking Green Tea Extracts

If you are one of most Americans who takes a prescription drug, youll want to avoid green tea extract. Their high doses of caffeine can have negative interactions with medications you are taking, or cause them to not work at all. Scary! Green tea extracts high dose of vitamin K can make blood thinning medication such warfarin or aspirin ineffective. When taken together with MAOIs, green tea extract can cause a severe increase in blood pressure. These are just a few of the possible drug interactions of green tea extract. Always consult your doctor before starting any dietary supplement or better yet, just avoid them.

Can Green Tea Prevent Heart Disease


Some data suggests that green tea can reduce the risk of cardiovascular diseasea narrowing of the arteries that can lead to heart attack, chest pains, or stroke.

For example, in a study of more than 40,500 adults, researchers in Japan found that those who consumed five or more cups of green tea per day were 26 percent less likely to die of cardiovascular disease over an 11-year period than those who drank just one cup per day.

Similarly, a study of 76,979 people published in the Journal of Epidemiology and Community Health in 2011 found that women who drank one to six cups of green tea per day had a reduced risk of dying of cardiovascular disease compared with those who drank none.

How might green tea protect the heart? Experts say it may reduce high cholesterol levels and high blood pressure, which are important factors in cardiovascular disease.

But while this is a potential benefit, it’s not conclusive, and high doses of green tea can reduce the effectiveness of the drug nadolol, used to treat high blood pressure and heart problems, cautions NIH.

To reduce your risk of diseases such as cancer and heart disease , he says, you need to eat a healthy diet that includes plenty of fruit, vegetables, and whole grains. You should also exercise and avoid smoking.

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Potential Health Benefits Of Green Tea Extract: Polyphenols And Antioxidants

Green tea extract is special among tea products because it is the only tea that doesnt rely on the oxidation of the plants young leaves. Instead, the leaves are steamed fresh at high temperatures. This process deactivates oxidizing enzymes and leaves the plants polyphenol content completely intact.4

The polyphenols in green tea extract are called flavonols and catechins. They make up about 40 percent of the extractable solids in the dried leaves of green tea. The main polyphenols are epicatechin, epigallocatechin, epicatechin-3-gallate, and epigallocatechin-3-gallate .5

The polyphenols in green tea extract have long demonstrated the many potential health benefits, including helping to support:

  • Your bodys defense against free radical damage
  • Cell health
  • Metabolic health
  • Gut health6

While the antioxidants and polyphenols in green tea extract are notable, green tea extract contains other bioactive compounds and nutrients to help support your overall health. Take a look at the nutritional content of green tea extract listed here.

Neuroprotective Properties Of Green Tea

Human brains consume approximately 20% of the oxygen inhaled, but its antioxidant activity is less than that of other organs . This increases the possibility of an increased level of ROS inside the brain, which can have serious health effects such as mitochondrial dysfunction and apoptosis that could lead to neurodegenerative diseases like Alzheimerâs and Parkinsonâs disease .

Tea polyphenols were found to directly scavenge ROS and RNS, inhibit the activity of nitric oxide synthase, xanthine oxidase, cyclooxygenases, and lipoxygenases, along with nuclear factor-кB and activator protein-1, and induce antioxidant enzymes such as glutathione S-transferases and superoxide dismutases to bind and chelate excess metals such as iron and copper, in vitro . EGCG can modulate the accumulation of proteins like Huntingtin, β-amyloid, and α-synuclein, and thereby enhance the clearance of three AD-relevant phosphorylated tau epitopes in primary neurons . Green tea and fractions of green tea aroma were found to delay Aβ-induced paralysis, which led to suppression of Alzheimerâs in transgenic nematode strains.

A cross-sectional study conducted in China with 2015 subjects aged over 65 years suggested that consumption of tea reduced the prevalence of Alzheimerâs disease and cognitive impairment . Another study done with 215 subjects suggested that regular consumption of tea could reduce the level of Parkinsonâs disease .

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The Dangers Of Green Tea Extract

Green tea leaves have the content of polyphenols for 30% with the concentration of EGCG is the highest. When you take the green tea supplement, then you get much higher concentration of EGCG. When being consumed excessively, this green tea extract supplement may cause the serious health problems as follows:

  • Liver Toxicity

From the study done by Bonkovsky, it is shown that 9 people were positive with liver toxicity after consuming the green tea extract excessively or more that its normal dosage. The over dosage of the extract may range from 10 to 29 milligrams per kilogram every day. From the study, the function of the liver can be in its normal state if the consumption of high dosage of EGCG is being stopped.

  • Liver and Kidney Damage

Another study on the consumption of green tea is that it is good for your health if you consume it in moderation every day. It is believed that green tea can be used to prevent cancer and heart disease. On contrary, if it is over consumed, it can cause the liver and kidney damage. if you drink only green tea, you need to keep it for 10 cups maximum.

The problem with the green tea extract is that it can contain 50 times polyphenols higher compared to the polyphenols content in one serving cup. If people are not aware of this fact, they may get serious health problems such as liver or kidney damage.

  • Tumor Growth

Ranking The Best Green Tea Extract Of 2021

Green Tea Extract FAT BURNER by Nobi Nutrition Review

Green tea is one of the most powerful natural fat-burners, and on top of that, it has an incredible variety of health benefits. Its antioxidants help improve risk factors for heart disease, and it may even be able to help sustain cognitive function into old age.

The genesis of green tea extract as a supplement comes from studies on regular drinkers of green tea, which have found remarkable health benefits. If you dont want to gulp down half a dozen cups of tea every day, green tea extract is a fantastic alternative.

Looking for the best green tea extract supplements around? Our research team has done a thorough review of your options and has ranked the best supplements on the market.


The name BulkSupplements is synonymous with pure, inexpensive, and high-quality supplements packaged in loose powder form.

This is exactly the case with its green tea extract offering. It comes in a sealable foil bag containing the loose powdered extract, leaving the measuring up to you.

The green tea extract is standardized to contain at least 50% polyphenols. Serving size is a bit arbitrary with a loose powder, but per 400 milligrams, Bulk Supplements Green Tea Extract contains 270 mg of EGCG and 1 mg of caffeine.

The super-pure formulation, plus the fact that its available in both powder form and capsule form makes it our top pick overall.

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Benefits Vary In Individuals

Given green tea’s mainstream popularity, it’s worth mentioning that each person can experience a different response to drinking green teaâmuch like drinking coffee . There are some folks who just don’t tolerate the substances in green tea wellânot out of choice, mind you. Some people may experience sudden heart palpitations, anxiety, and other general weirdness after taking green tea.

If you experience aforementioned general weirdness, you should first consult your doctor before adopting any sort of green tea-consuming habit.

How Should I Take Green Tea

When considering the use of herbal supplements, seek the advice of your doctor. You may also consider consulting a practitioner who is trained in the use of herbal/health supplements.

If you choose to use green tea, use it as directed on the package or as directed by your doctor, pharmacist, or other healthcare provider. Do not use more of this product than is recommended on the label.

Do not use different formulations of green tea at the same time, unless specifically directed to do so by a health care professional. Using different formulations together increases the risk of an overdose.

If you need a cardiac stress test you should stop taking green tea at least 24 hours before your test.

Store at room temperature away from moisture and heat.

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