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

다른 이름: 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

건강 상태	등급	연구	참여자
Obesity	B	14	1500	보기 →
Abdominal Fat Reduction	B	8	600	보기 →
Exercise Performance for Weight Loss	C	6	300	보기 →
Weight Loss Plateau	C	5	300	보기 →

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)

복용 중인 모든 건강기능식품에 대해 반드시 의료 전문가에게 알리십시오.

Related Ingredients

Caffeine Capsaicin Synephrine Forskolin

핵심 정보

용량: General: 250-500 mg/day standardized to 50% EGCG; Equivalent: 3-5 cups green tea/day; Weight_Management: 400-800 mg EGCG/day
제형: capsule tablet powder liquid extract
천연 원료: Green tea, Matcha, White tea, Oolong tea
상한 섭취량: 800 mg EGCG/day (hepatotoxicity risk above this; rare but documented)
권장 복용 시간: With meals (reduces nausea risk); avoid on empty stomach; space from iron-containing foods/supp

근거 요약

Obesity B

Abdominal Fat Reduction B

Exercise Performance for Weight Loss C

Weight Loss Plateau C

FDA 면책 조항: 이 내용은 미국 식품의약국(FDA)의 평가를 받지 않았습니다. 이 웹사이트의 제품 및 정보는 질병의 진단, 치료, 완치 또는 예방을 목적으로 하지 않습니다. 제시된 근거 등급은 발표된 동료 심사 연구에 대한 우리의 분석에 기반하며, 의학적 조언을 구성하지 않습니다. 건강기능식품 복용을 시작하기 전에 반드시 의료 전문가와 상담하십시오.