Safety guide
Is Green Tea Extract Safe for Your Liver?
For most people it is fine, but not for everyone. LiverTox rates green tea extract a well-established cause of liver injury, with more than 100 cases, most 1 to 6 months after starting (LiverTox: green tea). EFSA saw liver-enzyme rises at 800 mg of EGCG a day or more and named no safe supplement dose (EFSA: safety of green tea catechins). Slim Metrix lists green tea extract in its 276 mg blend.
Written by the Slim Metrix editorial teamUpdated · 7 min read
Tea vs extract
Why do doctors watch green tea extract and the liver?
Because liver injury has been reported in some people who use green tea products, mainly concentrated extracts (NCCIH: green tea). A cup of brewed tea and a capsule of extract are not the same thing.
Extracts pack the plant's catechins, including EGCG, into a small dose. The Slim Metrix label lists green tea leaf standardized to 98% polyphenols, 80% catechins and 50% EGCG (Slim Metrix label graphic). It sits second in the 276 mg blend, after alpha lipoic acid.
Liver injury from these products is rare. It is also well documented, which is why it deserves a clear look.
The evidence
What do LiverTox and EFSA say about green tea extract?
Both treat it as a real liver risk. LiverTox gives green tea its highest likelihood score, and EFSA could not name a supplement dose it considered safe.
| Source | Finding | What it means for you |
|---|---|---|
| LiverTox (NIH) | Score A, a well-established cause of liver injury; more than 100 cases tied to extract (LiverTox: green tea) | Rare, but it does happen |
| LiverTox timing | Usually 1 to 6 months after starting (LiverTox: green tea) | The first months are when to stay alert |
| EFSA (Europe) | 800 mg or more of EGCG a day raised liver enzymes; no safe supplement dose identified (EFSA: safety of green tea catechins) | Lower doses are not a guarantee |
| NCCIH (NIH) | Liver injury reported mainly with extracts; high doses lowered nadolol levels (NCCIH: green tea) | Brewed tea and extracts differ |
Dose check
How much EGCG is in a Slim Metrix capsule?
The label does not say. The bars show the largest amount that could fit.
Even if the whole 276 mg blend were green tea extract at 50% EGCG, one capsule would hold under 138 mg of EGCG. It cannot be the whole blend, because seven other ingredients share it. If split equally, green tea extract would be about 34.5 mg; the real split is not published (FDA: labeling guide (proprietary blends)).
That is well under the level where EFSA saw enzyme rises. But EFSA did not identify a safe supplemental dose (EFSA: safety of green tea catechins), so a small amount lowers the odds rather than removing them. Do not stack Slim Metrix with other green tea extract products.
Caffeine
Does the green tea extract in Slim Metrix contain caffeine?
The label does not say. It lists polyphenols, catechins and EGCG, but no caffeine amount and no "decaffeinated" note (Slim Metrix label graphic).
NCCIH says green tea's catechins and caffeine together may have a modest effect on body weight (NCCIH: green tea). If you are sensitive to caffeine, ask the order desk at +1 (855) 482-1597 whether the extract is decaffeinated, and take your capsule in the morning, as the label suggests.
A word on one brand image: a file the brand named for cinnamon shows matcha. Cinnamon is not an ingredient in Slim Metrix.
Does it help?
Does green tea extract help with weight loss?
Not by much. A Cochrane review of 15 weight-loss studies found a small, non-significant loss, and outside Japan the difference was about 0.09 pounds (0.04 kg) (Cochrane review: green tea and weight).
NIH's summary puts green tea at about 2.1 pounds (0.95 kg) more than placebo, an effect of debatable clinical relevance (NIH ODS: weight-loss supplements (health professional fact sheet)). NCCIH says green tea extracts have not been shown to be effective for weight loss (NCCIH: weight control). So the trade is a small, uncertain benefit against a small, real liver risk.
Before you start
Who should ask a doctor before taking green tea extract?
Anyone who has had liver disease, or liver trouble after any supplement, should ask first. So should anyone taking the heart drug nadolol (NCCIH: green tea).
Ask about a baseline test
Ask whether a liver blood test before you start makes sense for you.
Ask what to watch for
Ask which signs of liver trouble should make you stop and call.
Mark your calendar
Most cases appear 1 to 6 months in, so check in with yourself at each month.
The green tea ingredient page has the full profile.
Bottom line
What if you already take Slim Metrix?
Keep it to one capsule a day and skip other green tea extract products. If you notice signs of liver trouble, stop and see a doctor. Tell every provider you take it (NCCIH: using dietary supplements wisely).
FAQ
Green tea extract and the liver: your questions
Could Slim Metrix harm my liver?
It is possible but rare. Slim Metrix contains green tea extract, which LiverTox calls a well-established cause of liver injury, with more than 100 published cases (LiverTox: green tea). Nobody can predict who will react. If you have had liver problems, ask your doctor before you start.
How long does it take for green tea extract to affect the liver?
Usually 1 to 6 months. LiverTox says liver injury from green tea extract typically appears within that window after a person starts the product (LiverTox: green tea). That makes the first half-year the time to stay alert and to stop and get checked if something feels wrong.
Is drinking green tea the same as taking green tea extract?
No. NCCIH says liver injury has been reported mainly with green tea extracts, not with brewed tea (NCCIH: green tea). Extracts concentrate catechins such as EGCG into a small dose. Enjoying tea as a drink is a different exposure from a standardized extract in a capsule.
How much EGCG is too much?
EFSA found that 800 mg or more of EGCG a day as a supplement raised liver enzymes, and it did not identify any supplemental dose it judged safe (EFSA: safety of green tea catechins). One Slim Metrix capsule holds under 138 mg even in the most extreme case, but lower is not the same as risk-free.
Is there caffeine in Slim Metrix?
The label does not say. It lists green tea leaf standardized for polyphenols, catechins and EGCG, with no caffeine amount and no decaf note (Slim Metrix label graphic). If caffeine bothers you, call the order desk to ask, and take the capsule in the morning as the label suggests.
Does the milk thistle in Slim Metrix protect the liver?
There is no good evidence that it does. NCCIH says there is not enough high-quality evidence for milk thistle in liver disease (NCCIH: milk thistle), and a large hepatitis C trial found no benefit (MSK About Herbs: milk thistle). It does not cancel out any risk from green tea extract.
Can I take Slim Metrix with nadolol?
Ask your doctor first. NCCIH says high doses of green tea lowered blood levels of nadolol, a heart and blood pressure drug (NCCIH: green tea). The green tea amount in Slim Metrix is not published, so nobody can say how large the effect would be.
Who wrote this
Written and reviewed by
Plain-language pages built from the brand's label graphic, the sales page and linked medical sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a U.S. stocking partner for Slim Metrix, not by the manufacturer. We earn money when you buy through our order links.
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