What is Epigallocatechin Gallate (EGCG)?

Epigallocatechin gallate (EGCG) is a catechin polyphenol found in high amounts in green tea. It is widely studied for antioxidant and anti-inflammatory effects.

What are the main benefits of EGCG?

EGCG supports antioxidant defenses and may help reduce oxidative stress and inflammation. Research also suggests potential support for metabolism, cardiovascular markers, and cancer-related pathways, though human evidence varies by outcome.

What is a typical EGCG supplement dosage?

Common supplemental intakes are often in the 200–800 mg per day range. Individual needs and tolerance can vary, and higher doses may increase the risk of side effects.

Can EGCG help with weight loss?

EGCG may modestly support fat oxidation and weight management, especially when combined with diet and exercise. Effects are generally small and not guaranteed.

Are there safety concerns with EGCG supplements?

EGCG can cause side effects in some people, and concentrated extracts may be harder on the liver than tea for certain individuals. People with liver disease, those who are pregnant or breastfeeding, or those taking medications should consult a clinician before use.

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Epigallocatechin Gallate
(EGCG)

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Epigallocatechin gallate (EGCG) is a green tea polyphenol with antioxidant, metabolic, and potential cancer-protective effects.

Anti-inflammatory Cardiovascular Support Cancer-inhibitor Antioxidant Weight Management

dose range

200–800 mg

Divided dose (e.g., 2–3 times per day)

Consumption

Take with water, preferably on an empty stomach or between meals to improve absorption. Do not exceed 800 mg daily unless supervised.

Not fat-soluble.

Best time

Taking on an empty stomach or between meals may increase absorption, but may also raise risk of nausea.

Description

EGCG is the most abundant catechin in green tea, researched for its strong antioxidant capacity and possible roles in weight management, cardiovascular health, and cancer risk reduction.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Supported by multiple clinical trials and population studies for antioxidant and metabolic effects; evidence for cancer prevention is promising but not conclusive in humans.

Antioxidant and Anti-inflammatory Activity

Strong

EGCG neutralizes free radicals and lowers oxidative stress, reducing inflammation and supporting cellular health.

Particularly relevant for: General adults · People seeking antioxidant support

1 · NIH NCCIH Green Tea Fact Sheet 2 · PubMed – Antioxidant and anti-inflammatory effects: Nutr Biochem 2006;17(9):561-85.5 · Examine.com – Epigallocatechin gallate (EGCG) supplement overview

Supports Weight Management and Metabolism

Moderate

Supplemental EGCG can enhance fat oxidation and modestly support weight loss when combined with diet and exercise, especially in overweight individuals.

Particularly relevant for: Individuals concerned with weight management · Metabolic health

3 · PubMed – Fat loss and metabolic effects: Am J Clin Nutr. 2009 Dec;90(6):1558-61.8 · Cochrane Review on Green Tea for weight loss in adults 5 · Examine.com – Epigallocatechin gallate (EGCG) supplement overview

Potential Cancer Risk Reduction

Limited

EGCG may help inhibit cancer cell growth and exert protective effects, though clinical evidence in humans remains limited.

Particularly relevant for: Cancer prevention interest groups

4 · PubMed – Cancer prevention potential: J Am Coll Nutr. 2012 Feb;31(1):4-9.5 · Examine.com – Epigallocatechin gallate (EGCG) supplement overview

Cardiovascular Health Support

Moderate

EGCG can modestly improve cholesterol profiles and endothelial function, supporting heart health.

Particularly relevant for: Adults concerned about cardiovascular health

1 · NIH NCCIH Green Tea Fact Sheet 5 · Examine.com – Epigallocatechin gallate (EGCG) supplement overview 7 · ODS – Dietary Supplements Fact Sheet: Green Tea

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

EGCG is generally safe at moderate doses, but can cause serious liver injury at high intakes or in sensitive populations.

warning notices

High doses (>800 mg/day) have been linked to acute liver toxicity.
Risk increases with pre-existing liver disease, certain medications, or fasting use.
Mild side effects include nausea and GI upset, especially on an empty stomach.
Avoid if you have known liver disease or dysfunction.
Discontinue and consult a healthcare provider if you experience symptoms of liver injury (fatigue, jaundice, dark urine).
Use caution and consult a physician if taking blood thinners like warfarin due to potential interactions.
Do not exceed 800 mg daily unless under clinical supervision.

Known interactions with medications