Safety research
Green Tea Extract and Your Liver: What the Research Says
Green tea extract pills are a rare but well-documented cause of liver injury. LiverTox rates the link at its highest level, with over 100 cases, usually 1 to 6 months after starting (LiverTox, Green tea). Brewed tea is not the concern. One Slim Metrix capsule holds at most 138 mg of extract, below the doses in injury reports, but no safe threshold is known.
Written by the Slim Metrix editorial teamUpdated · 8 min read
The short version
Is green tea extract bad for your liver?
For most people, no, but it can be. LiverTox, the federal liver-injury database, gives green tea extract a score of A: a well-established cause of liver injury you can see on blood tests and in symptoms (LiverTox, Green tea).
Cases are rare compared with how widely the extract is used. More than 100 have been reported (LiverTox, Green tea). NCCIH calls liver injury uncommon and notes it was seen mainly with extracts in pills, not with tea you brew (NCCIH, Green tea).
In the capsule
How much green tea extract is in Slim Metrix?
The label does not print an amount. Green tea extract is second in a 276 mg blend, so it can weigh at most 138 mg, or half the blend (FDA, Labeling guide ch. IV). The label says the extract is 80% catechins and 50% EGCG, which works out to at most about 110 mg of catechins and about 69 mg of EGCG. That is our math from the label order, and the real amounts are probably lower.
Dose context
How does one capsule compare with the doses in liver reports?
It is well below them, but that does not make it risk-free. LiverTox says no dose threshold has been set, and injured patients took roughly 800 mg to 1.86 g of extract a day (LiverTox, Green tea).
| Source of the number | Amount a day | What happened |
|---|---|---|
| One Slim Metrix capsule (ceiling) | 138 mg extract; about 110 mg catechins | Not studied |
| LiverTox case reports | About 800 mg to 1.86 g extract | Liver injury, mostly hepatitis-like |
| 12-month NIH-cited trial | 1,315 mg catechins | Liver enzymes rose vs placebo |
Many reported cases involved multi-ingredient weight-loss products (LiverTox, Green tea). In those, the extract is mixed with other compounds, which makes it hard to say what caused the harm (NIH ODS, Weight-loss supplements).
Risk factors
Who is more likely to have a liver reaction to green tea extract?
People with a specific immune-related gene variant appear more likely to react. NCCIH says 5 to 15 percent of Americans carry it (NCCIH, Green tea). Most people do not know whether they carry it.
- Past reactions: injury often returns faster when the extract is restarted (LiverTox, Green tea).
- Stacked products: two green tea formulas at once raise your total.
- Empty stomach: NIH advises taking green tea extracts with food (NIH ODS, Weight-loss supplements).
- Liver history: if you have had liver problems, ask your doctor before any extract.
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Order nowWarning signs
What are the signs of liver damage from green tea extract?
The pattern looks like hepatitis, often with jaundice. LiverTox says it usually starts 1 to 6 months after a person begins the extract (LiverTox, Green tea).
Dark urine, yellow skin or eyes, or pain in the upper belly while taking green tea extract needs a doctor quickly. Stop the product and bring the bottle with you.
- Months 1 to 6
The usual window for onset, often with a hepatitis-like pattern.
- After stopping
Most people recover once the extract is stopped (LiverTox, Green tea).
- Severe cases
Liver failure, transplant and deaths have been reported, though rarely (LiverTox, Green tea).
Daily use
When is the best time to take a green tea extract supplement?
With a meal. For Slim Metrix, that means one capsule with breakfast.
- Morning, about 8:00
1 capsule with breakfast and a glass of water.
- A 45-minute walk
Brisk walking counts toward CDC's 150 minutes a week.
- Evening food-diary check
A few minutes to note what you ate. CDC suggests a short food diary to spot easy changes.
- Sleep
Enough sleep is one of CDC's steps for losing weight.
Activity target (CDC, Adult activity), food diary and sleep (CDC, Losing weight), green tea extract with food (NIH ODS, Weight-loss supplements).
The label says to take one capsule, preferably in the morning, and the sales page adds "with or without food" (Slim Metrix sales page). With food is the safer pick for any green tea extract (NIH ODS, Weight-loss supplements). Our how to use guide covers missed doses.
Other effects
Does green tea extract have other side effects or interactions?
Yes. NCCIH lists nausea, constipation, belly discomfort and higher blood pressure (NCCIH, Green tea). Green tea also contains caffeine, though no caffeine amount is printed on the Slim Metrix label.
It can lower blood levels of nadolol, a heart medicine, and atorvastatin, a cholesterol medicine, and it interacted with raloxifene in one study (NCCIH, Green tea). If you take any of these, ask your pharmacist first. The full list of cautions is on the side effects page, and the green tea extract profile covers the weight research.
FAQ
Green tea extract and liver FAQ
Can green tea extract cause liver damage?
Yes, rarely. LiverTox rates green tea extract a well-established cause of liver injury, with more than 100 reported cases, most from extract pills in weight-loss products (LiverTox, Green tea). Most people recover after stopping, but severe cases have led to liver failure.
Is drinking green tea bad for your liver?
Brewed tea is not the main concern. NCCIH says reported liver injuries mostly involved concentrated green tea extracts in pills (NCCIH, Green tea). If you have liver disease, ask your doctor about any green tea product, including teas sold for weight loss.
How much green tea extract is safe per day?
No safe limit has been set. LiverTox says no dose threshold is established; injured patients took roughly 800 mg to 1.86 g of extract a day (LiverTox, Green tea). A trial of 1,315 mg of catechins a day raised liver enzymes (NIH ODS, Weight-loss supplements). Lower is not a guarantee.
How fast can green tea extract harm the liver?
Usually within 1 to 6 months of starting (LiverTox, Green tea). That is why the first few months on any extract deserve attention. Watch for dark urine, yellow skin or eyes or upper belly pain, and stop if they appear.
Does Slim Metrix have enough green tea extract to hurt the liver?
Its share is small, at most 138 mg per capsule by label order, below the amounts in case reports. But no threshold is known and people with a certain gene variant react more easily (NCCIH, Green tea). Take it with food and stop at any warning sign.
Should I take green tea extract on an empty stomach?
No. NIH advises taking green tea extracts with food (NIH ODS, Weight-loss supplements). For Slim Metrix, take the one daily capsule with breakfast. Do not take a second capsule to make up for a missed day.
Who wrote this
Written and reviewed by
Plain-language pages built from the label, the sales page and linked public health sources.
Last updated . See our editorial standards and how we check reviews. This website is run by Slimmetrixfit, a licensed U.S. retail desk for Slim Metrix, not by the manufacturer. Orders are processed by BuyGoods on the brand's sales page. Buying through our order links earns us a commission.
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More about Slim Metrix
Green tea extract
Second in the blend: at most 138 mg of extract and about 69 mg EGCG, a tiny weight effect and a liver flag.
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Side effects
Ingredient-by-ingredient side effects, medicine interactions, the green tea liver signs and when to stop and call a doctor.
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How to use
One capsule each morning: food, missed doses, other supplements, medicines and the signs that mean stop.
Read moreLicensed U.S. retail desk for Slim Metrix
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