Ingredient profile
Berberine in Slim Metrix: The Dose, the Research and the Risks
Slim Metrix lists berberine HCl as the fourth of eight ingredients in a 276 mg proprietary blend, so its exact amount is not published. Any share of that blend falls well short of the 250 to 500 mg doses, taken two or three times a day, used in research. Berberine is not for pregnancy or breastfeeding, and it can change how some medicines work.
Written by the Slim Metrix editorial teamUpdated
Label facts
How much berberine does one Slim Metrix capsule hold?
Nobody outside the maker knows, because the label does not say. Berberine is one of eight ingredients that share a single 276 mg proprietary blend (Slim Metrix label graphic).
Federal rules let a blend show only its total weight, as long as the ingredients are listed from most to least by weight (FDA: labeling guide (proprietary blends)). Berberine sits fourth, so it weighs less than 276 mg, and very likely much less. If the eight ingredients were split equally, each would be about 34.5 mg. The true split is not on the label.
| Name on the label | Berberine HCl (from Berberis aristata root, 97% berberine) |
|---|---|
| What it is | Berberis aristata root (Indian barberry) |
| Form | Plant alkaloid |
| Amount per capsule | Part of the 276 mg blend (not disclosed) |
| What research used | 250 to 500 mg two or three times a day |
| Strength of evidence | Small waist and glucose drops; mostly low-quality trials |
| Why it is sold | Sold for blood sugar and weight |
| Main caution | Not for pregnancy, breastfeeding or newborns; raises cyclosporine levels and slows CYP drug enzymes. |
Read the panel
What does "Berberine HCL from Berberis aristata root" mean?
It means the berberine comes as a salt, berberine hydrochloride, made from the root of Berberis aristata, a plant also called Indian barberry. Per the label, the extract is 97% berberine.
The panel prints it as "HCL (from Berberis aristata Root 97% Berberine)". The usual spelling is "HCl"; the capital L is a printing style, not a different ingredient (Slim Metrix label graphic).
Purity tells you what the extract is made of, not how much is in each capsule.
| Berberine HCl | Berberine in salt form (hydrochloride) |
|---|---|
| Berberis aristata root | The plant source, Indian barberry |
| 97% berberine | How pure the extract is |
| Place in the blend | Fourth of eight, after alpha lipoic acid, green tea and milk thistle |
| Amount per capsule | Not published |
See every line explained on the Supplement Facts page.
Dose check
Can one capsule reach the berberine dose used in studies?
No. Even if the whole blend were berberine, one capsule would be under 56% of the lowest daily dose in research. Each bar below is drawn to scale.
LiverTox lists the usual herbal dose as 250 to 500 mg, two or three times a day (LiverTox: berberine). That is 500 to 1,500 mg daily. Slim Metrix is one capsule a day with a 276 mg blend shared by eight ingredients. Study results do not carry over to this capsule.
The research
Does berberine help with weight loss?
At study doses, berberine trimmed waist size and fasting blood sugar a little. Its effect on body mass index did not hold up once weak trials were taken out.
A 2025 review pooled placebo-controlled trials of berberine (Liu et al.: berberine and metabolic measures (meta-analysis)). Here is what it found, in plain numbers:
| Measure | Result | How solid |
|---|---|---|
| Waist size | About 3.3 cm (1.3 inches) smaller | Only 4 trials |
| Fasting blood sugar | About 0.5 mmol/L (roughly 9 mg/dL) lower | 6 trials |
| Body mass index | Drop of 0.44 | Not significant after removing low-quality trials |
| Trial quality | 2 of 12 trials rated high quality | Weak overall |
Memorial Sloan Kettering also calls the diabetes studies of berberine limited in quality (MSK About Herbs: berberine). None of that work tested Slim Metrix. For a closer look, read our berberine research article.
Myth check
Does berberine act like a GLP-1 drug?
No study cited on this site shows berberine acting like a GLP-1 medicine. Ads that compare it to weight-loss injections are repeating a myth, not a finding.
GLP-1 drugs are prescription medicines with their own trials and FDA review. Slim Metrix is sold as a dietary supplement, with no such review. FDA warns that even unapproved GLP-1 products skip review for safety, effectiveness and quality, and it tells people to buy these drugs only from state-licensed pharmacies (FDA: concerns about unapproved GLP-1 drugs).
On a GLP-1 medicine? Keep taking it as prescribed and ask your prescriber first. Our article on GLP-1 drugs versus supplements explains the difference.
Safety first
Who should not take berberine?
Skip berberine if you are pregnant or breastfeeding. Ask a doctor or pharmacist first if you take transplant drugs, diabetes medicine or other prescriptions.
Pregnancy and breastfeeding
Berberine can harm newborns (NCCIH: goldenseal and berberine), and it may worsen jaundice in infants (MSK About Herbs: berberine).
Cyclosporine or tacrolimus
Berberine may raise the blood levels of these transplant drugs (MSK About Herbs: berberine).
Drugs cleared by CYP enzymes
In people, berberine lowered the activity of CYP2D6, CYP2C9 and CYP3A4, enzymes that break down many common medicines (MSK About Herbs: berberine). A pharmacist can tell you which of yours use them.
Metformin
Goldenseal, an herb that contains berberine, lowered metformin levels by about 25% in one study (NCCIH: goldenseal and berberine). Never change a diabetes medicine on your own.
LiverTox lists no published liver-injury cases from berberine (score E) (LiverTox: berberine). See every interaction on our side effects page.
What helps more
What works better than berberine for weight and blood sugar?
A lifestyle program beats any single supplement in the research. In the Diabetes Prevention Program, a 7% weight-loss goal plus 150 minutes of activity a week cut new type 2 diabetes by 58%, compared with 31% for metformin (NIDDK: Diabetes Prevention Program results).
Set a first goal
Aim for 5 to 10% of your starting weight within 6 months, with a reduced-calorie eating plan and more activity (NIDDK: choosing a safe weight-loss program).
Go at a steady pace
Losing about 1 to 2 pounds a week is more likely to last (CDC: losing weight).
The rest of the formula
Which other ingredients share the blend with berberine?
Seven more blend ingredients, plus zinc and chromium. Pick one to read its profile.
FAQ
Berberine in Slim Metrix: common questions
Does berberine work like Ozempic?
No, it does not. Berberine is a plant compound, and Ozempic is a prescription GLP-1 medicine. The berberine studies cited here found a smaller waist and slightly lower fasting glucose at doses of 500 to 1,500 mg a day, mostly in low-quality trials (Liu et al.: berberine and metabolic measures (meta-analysis)). One Slim Metrix capsule holds far less than that.
Can I take berberine while pregnant or breastfeeding?
No. NCCIH says berberine can be harmful to newborns, so herbs that contain it should not be used in pregnancy, while breastfeeding or in infants (NCCIH: goldenseal and berberine). It may also worsen jaundice in babies, says Memorial Sloan Kettering (MSK About Herbs: berberine). So Slim Metrix is not for anyone pregnant or nursing.
Does berberine interact with metformin?
It may. In one study, goldenseal extract, a berberine-containing herb, lowered metformin levels by about 25% (NCCIH: goldenseal and berberine), and the chromium in Slim Metrix may add to metformin's effect on blood sugar (NIH ODS: chromium fact sheet). Ask the doctor who prescribes your metformin before you start, and keep taking it as directed.
Can berberine damage the liver?
Not that research shows. LiverTox reports no liver enzyme rises or published cases of liver injury from berberine and gives it a likelihood score of E (LiverTox: berberine). Slim Metrix also contains green tea extract, though, which is a rare but well-documented cause of liver injury.
What is berberine HCl?
Berberine HCl is berberine in its hydrochloride salt form. In Slim Metrix it comes from Berberis aristata root, also called Indian barberry, and the label says the extract is 97% berberine (Slim Metrix label graphic). The label prints it as "HCL" in capitals, but it is the same salt.
How much berberine do weight-loss studies use?
Studies used 250 to 500 mg two or three times a day, or 500 to 1,500 mg daily (LiverTox: berberine). Pooled trials at those doses found only a modest waist and glucose change (Liu et al.: berberine and metabolic measures (meta-analysis)). Slim Metrix's whole blend is 276 mg for eight ingredients, so its berberine is far below that range.
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.
Keep reading
More about Slim Metrix
Ingredients
All ten Slim Metrix ingredients side by side, with what research used and the main caution for each.
Read moreSide effects
Side effects of all ten Slim Metrix ingredients, the medicines to ask about, and who should not take it.
Read moreBerberine and medications
Cyclosporine, tacrolimus, metformin and CYP drugs: how berberine can interact, and what to ask before you start.
Read moreU.S. stocking partner for Slim Metrix
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