What is the recommended dosage for Green Tea Extract (EGCG)?

General: 250-500 mg/day standardized to 50% EGCG; Equivalent: 3-5 cups green tea/day; Weight Management: 400-800 mg EGCG/day

What are the side effects of Green Tea Extract (EGCG)?

Potential side effects include: Nausea on empty stomach, Insomnia (caffeine content), Rare hepatotoxicity at high doses, Reduced iron absorption.

What is green tea extract and how may it support weight management?

Green tea extract is a concentrated form of Camellia sinensis leaves, rich in catechins, particularly EGCG. Clinical studies suggest it may modestly increase fat oxidation and energy expenditure. These statements have not been evaluated by the FDA, and this product is not intended to diagnose, treat, cure, or prevent any disease.

What dosage of green tea extract has been studied in clinical trials?

Clinical trials have typically used 250–500 mg of green tea extract standardized to contain 200–400 mg of EGCG per day. Studies generally lasted 8–12 weeks. Dosages above 800 mg EGCG daily have been associated with liver toxicity in some reports.

What are the potential side effects of green tea extract?

Common side effects include nausea, insomnia, and digestive discomfort, particularly on an empty stomach. High doses have been linked to liver injury in rare cases. Green tea extract contains caffeine, which may cause jitteriness, elevated heart rate, and sleep disturbances in sensitive individuals.

Green Tea Extract (EGCG)
Green Tea Extract (EGCG)

thermogenic

别名: Epigallocatechin Gallate, EGCG, Camellia sinensis Extract, GTE

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About

A standardized extract from Camellia sinensis rich in epigallocatechin gallate (EGCG), one of the most extensively studied natural compounds for supporting thermogenesis and fat oxidation. Green tea extract has been reviewed in multiple Cochrane and systematic analyses for its role in supporting healthy body weight.

How It Works

Epigallocatechin gallate (EGCG) inhibits catechol-O-methyltransferase (COMT), prolonging norepinephrine signaling and increasing thermogenesis and fat oxidation. Also activates AMPK, which promotes fatty acid oxidation and inhibits lipogenesis in adipocytes.

Evidence For Conditions

健康状况	等级	研究数量	受试者
Obesity	B	14	1500	查看 →
Abdominal Fat Reduction	B	8	600	查看 →
Exercise Performance for Weight Loss	C	6	300	查看 →
Weight Loss Plateau	C	5	300	查看 →

Side Effects

Nausea on empty stomach
Insomnia (caffeine content)
Rare hepatotoxicity at high doses
Reduced iron absorption

Drug & Supplement Interactions

Nadolol (reduced bioavailability)
Iron supplements (reduced absorption)
Blood thinners (theoretical)
Other stimulants (additive effects)

请务必告知您的医疗保健提供者您正在服用的所有补充剂。

Related Ingredients

Caffeine Capsaicin Synephrine Forskolin

速览

剂量: General: 250-500 mg/day standardized to 50% EGCG; Equivalent: 3-5 cups green tea/day; Weight_Management: 400-800 mg EGCG/day
剂型: capsule tablet powder liquid extract
天然来源: Green tea, Matcha, White tea, Oolong tea
上限: 800 mg EGCG/day (hepatotoxicity risk above this; rare but documented)
最佳时间: With meals (reduces nausea risk); avoid on empty stomach; space from iron-containing foods/supp

证据摘要

Obesity B

Abdominal Fat Reduction B

Exercise Performance for Weight Loss C

Weight Loss Plateau C

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