Green Tea Extract
Concentrated catechins; linked to rare but serious acute liver injury.
By Suplagen Team · Updated
What it is
Green tea extract has been associated with clinically apparent acute liver injury, including rare liver failure; catechin content varies widely.
How it works
High-dose catechin (EGCG) exposure may trigger hepatotoxicity in susceptible individuals.
What the evidence says
Safety risk (hepatotoxicity) is a core constraint; efficacy evidence varies and does not justify high-risk dosing for many users.
How much to take
The catalog range is 250 to 500 mg of extract daily, and the whole entry comes with a warning attached: concentrated green tea extract at high doses has caused liver injury in susceptible people. The range is deliberately modest, and there's no case for exceeding it.
The weight evidence is graded mixed. That combination, a real safety risk and an uncertain benefit, is why we list it with a caution rather than a recommendation.
When and how to take it
With food, in the morning. Never on an empty stomach, and never doubled up with other catechin-heavy products.
Stop immediately if you notice jaundice, dark urine, or unusual fatigue, and get it checked. Avoid chronic high-dose use altogether.
Who should skip it
Anyone with active liver disease or a history of liver injury. It's off-limits in pregnancy. No drug interactions are listed, but hepatotoxicity is the dominating concern for concentrated extracts, and it applies to otherwise healthy people too.
Safety Notes
- Hepatotoxicity is the dominating safety concern for concentrated extracts.
- Not recommended during pregnancy or while breastfeeding.
- Use caution with: history of liver injury, active liver disease.
Common questions
What is a safe green tea extract dosage per day?
250 to 500 mg of extract, with food. Higher doses are where the liver injury reports cluster, so the range isn't a starting point to build from.
Is green tea extract safe?
At catalog doses with food, for people with healthy livers, generally. The risk is concentrated extracts at high doses, especially on an empty stomach. With any liver history, skip it.
Does green tea extract work for weight loss?
The evidence is mixed, and the catalog says it plainly. It doesn't justify high-risk dosing, and it isn't in any of our goal guides for that reason.