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Epigallocatechin

Epigallocatechin

What the trials found

Epigallocatechin has not been adequately studied for weight loss or related wellness outcomes, so evidence remains insufficient to support meaningful benefits.

Median effective dose, most-studied outcomes

  • Weight relative to height 300 mg 8 wk
Full protocol, 3 outcomes

Risk, worst reported severity

  • hepatotoxicity severe
  • blood bilirubin increased severe
All 8 events and interactions

What epigallocatechin actually does

Outcome Effect Evidence Dose Time Rank
Early research 1
Lose weight Not enough research Weight loss means carrying less total body weight over time.
trivial 		1 RCT 2 papers · n=128 300–800 mg 8 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

The limited eight-week weight-related trials used 300 to 800 mg daily. Despite those doses, the observed change in weight relative to height was trivial, so the research does not establish a useful target dose for weight management.1 A separate 300 mg daily protocol did not meaningfully improve overall antioxidant capacity over eight weeks.1

When and how long

The available trials ran for eight weeks, which tells you more about sustained use than about a best time of day. They do not establish whether morning, evening, split dosing, or taking it with a meal improves results. For concentrated green tea extracts, avoid fasting use because liver injury reports have focused attention on extract safety and dosing context.2

Forms & standardisation

The evidence does not identify a best epigallocatechin extract, or a label standardization that reliably changes weight or antioxidant outcomes. If you consider a green tea product, check whether the label lists total catechins, EGCG, caffeine, and the amount per serving. Brewed tea and concentrated extracts are not interchangeable exposures, particularly for safety.23

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Weight relative to height 300–800 mg 300 mg 8 wk 2 papers 2 sig. endpoints
Lower body fat percentage 800 mg — 8 wk 1 paper
Support overall antioxidant capacity 300 mg — 8 wk 1 paper

Adverse events and drug interactions

Safety events

hepatotoxicity severe
blood bilirubin increased severe
alanine aminotransferase increased severe
aspartate aminotransferase increased severe
Serious adverse events (any) severe
cholestasis moderate
weight decreased moderate
hypertriglyceridaemia moderate
In context

What this is and how it works

  • Across 2 studies (n=128), epigallocatechin showed no consistent weight-loss effect; no MCID comparison was reported.1
  • Four papers reviewed here span 30 outcomes, with limited human evidence concentrated in early research.1
  • Concentrated green-tea extracts containing epigallocatechin have been linked to liver-injury concerns.1

Epigallocatechin is a natural plant compound in tea leaves, especially green tea. You encounter it in brewed tea, but supplements deliver a far more concentrated dose, often alongside the related catechin EGCG. That concentration changes the safety conversation.23

In laboratory work, green tea catechins interact with the cell systems that handle oxidative stress and energy signals. Think of them as extra hands at a busy recycling station, sorting reactive chemical debris, but human trials have not shown that this activity reliably translates into higher whole-body antioxidant capacity.13

Bottom line

Epigallocatechin is not a compelling pick if your goal is weight loss, body-fat reduction, or a measurable antioxidant boost. The evidence is small and the observed weight effect is trivial. Given reported liver injury with concentrated green tea extracts, people with liver concerns or anyone seeking a casual wellness supplement should skip high-dose extracts and choose caution over hype.12

Frequently asked

Common questions

Does epigallocatechin help with weight loss?

Not based on the current small clinical evidence. Eight-week studies using 300 to 800 mg found only trivial changes in weight relative to height, so it is not a reliable weight-loss supplement.1

Is epigallocatechin the same as EGCG?

Not exactly. Epigallocatechin is one green tea catechin, while EGCG is epigallocatechin gallate, a closely related catechin that appears far more often on green tea extract labels.3

Should you take green tea extract on an empty stomach?

Avoid taking concentrated green tea extracts while fasting. Reports of liver injury have led experts to advise caution with extracts, especially at higher supplemental doses.2

Can epigallocatechin raise antioxidant levels?

An 8-week trial of 300 mg did not show a meaningful improvement in overall antioxidant capacity. Antioxidant activity in a test tube does not guarantee a noticeable change in your body.1

Sources

Sources

  1. 1. Dietary Supplements for Weight Loss: Health Professional Fact Sheet
  2. 2. Green Tea
  3. 3. Green Tea

Generated August 27, 2026

Related

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