Herbs

Green tea extract

Also called: EGCG, camellia sinensis extract

Concentrated green tea catechins.

Why people take it
Weight loss, antioxidants.
What the evidence says
Little or no weight loss.
How it is usually taken
Usually 250 to 500 mg of EGCG-standardised extract with food; do not take on an empty stomach.
Be careful
Concentrated extracts have caused serious liver damage, especially on an empty stomach. Drinking green tea is fine.
Medicines it can interact with
Liver injury at high doses; reduces the effect of nadolol and some other medicines; caffeine adds to stimulants.

Other herbs

EchinaceaElderberryGarlic extractGingerPeppermint oilMilk thistleSaw palmettoSt John's wortValerianChamomileLemon balmPassionflowerKavaRhodiolaGinkgoMoringaFenugreekCinnamonBlack seedLicorice

Common questions

What is Green tea extract?

Concentrated green tea catechins.

Why do people take Green tea extract?

Weight loss, antioxidants.

Does Green tea extract work?

Little or no weight loss.

How much Green tea extract do people take?

Usually 250 to 500 mg of EGCG-standardised extract with food; do not take on an empty stomach.

Is Green tea extract safe?

Concentrated extracts have caused serious liver damage, especially on an empty stomach. Drinking green tea is fine.

Does Green tea extract interact with medicines?

Liver injury at high doses; reduces the effect of nadolol and some other medicines; caffeine adds to stimulants.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.