EGCG (Green Tea Catechin): Uses, Benefits, Dosage & Safety
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Quick summary
EGCG is the main active catechin in green tea, studied for metabolism, antioxidant and heart effects. It's the compound behind green tea's modest fat-burning reputation — and the source of rare liver-injury concerns at high doses.
What is EGCG?
EGCG (epigallocatechin gallate) is the most abundant and active catechin in green tea. It's sold as a concentrated extract for metabolism, weight, antioxidant and cardiovascular support, providing far more EGCG than a cup of tea.
What EGCG is commonly used for
In supplements, EGCG is most often included for weight & metabolism, skin & anti-aging support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.
How EGCG works
EGCG is a potent antioxidant that may modestly increase fat oxidation and metabolic rate (especially with caffeine), and it influences several metabolic and inflammatory pathways. Concentrated doses are what drive both the potential benefits and the safety concerns.
What the evidence says
Here's an honest snapshot of what published research suggests about EGCG — including where the evidence is limited.
- EGCG/green tea extract has modest evidence for small effects on metabolism, weight and cardiovascular markers, often enhanced by caffeine. (PubMed research)
- High-dose concentrated extracts carry a rare but real risk of liver injury, which has prompted regulatory cautions. (PubMed research)
Typical dosage used in studies
Studies vary; concentrated extracts provide several hundred milligrams of EGCG, ideally taken with food to reduce liver risk. This is research information for context, not a recommendation — confirm what's appropriate for you with a healthcare professional.
Side effects and safety
Tea is very safe; concentrated EGCG extracts have a rare association with liver injury, especially on an empty stomach or at high doses. Take with food and avoid excessive amounts.
Medication interactions and who should avoid EGCG
Medication & safety check
It may interact with stimulants, blood thinners, blood-pressure and some other medications, and can reduce iron absorption. Caution with liver conditions.
This is general information, not personal medical advice. If you take any medication, confirm it's safe to combine with EGCG with your doctor or pharmacist first.
Sources & further reading
The summary above is drawn from peer-reviewed research and authoritative references. For general, authoritative background you can also consult:
- PubMed research on EGCG
- NIH Office of Dietary Supplements
- NIH National Center for Complementary and Integrative Health
- MedlinePlus (U.S. National Library of Medicine)
Frequently asked questions
Is EGCG the active part of green tea?
Yes — it's the main catechin behind green tea's antioxidant and metabolic effects.
Does EGCG burn fat?
It has a modest metabolic effect, enhanced by caffeine, but the impact on weight is small.
Is concentrated EGCG safe?
Tea is safe; high-dose extracts carry a rare liver-injury risk, so take with food and don't overdose.
Does it affect iron?
Yes — it can reduce iron absorption, so separate it from iron-rich meals or supplements.
Supplements that contain EGCG
On FactoWiki, EGCG appears in these reviewed products. Each review breaks down the full formula, pricing and safety.
- Neuro Serge — Brain & Memory
- ProstaPeak — Prostate & Urinary Health
- Gluco6 — Blood Sugar & Metabolism
- VittaBurn — Weight & Metabolism
- FlashBurn — Weight & Metabolism
- Mounjaboost — Weight & Metabolism
Related ingredients to explore
Ingredients often studied or formulated alongside EGCG — useful for understanding the full picture of a formula.