Berberine Benefits: What the Evidence Shows

Quick answer

Berberine benefits, in short: Berberine is a plant compound that has been studied mostly in people with type 2 diabetes. Reviews of trials in that group report lower blood sugar, and also lower cholesterol, triglycerides and BMI [1][2]. But many of the trials are small and of limited quality, and almost none are in healthy adults [2][3]. The common side effects are stomach-related, and berberine can raise the blood level of at least one prescription drug [5]. We rate the evidence C: encouraging results, mostly in particular groups, with quality gaps.

What is berberine?

Berberine is a natural chemical found in several plants, including barberry and the Chinese herb Coptis [1][6]. Plants containing it have been used in traditional Chinese formulas for a very long time [1], and it is now sold as a supplement. People take it hoping to support healthy blood sugar and cholesterol.

Berberine benefits: what might it help with?

Possible benefit	Rating	In plain words
Blood sugar (in people with type 2 diabetes)	Promising	Lower HbA1c and fasting glucose across many trials, though quality is limited [1][2]
Cholesterol and triglycerides	Promising	Lower LDL and triglycerides in trials, mostly in people with diabetes or high cholesterol [1][3]
Weight (BMI)	Early	A small BMI drop appeared in diabetes trials; effects in healthy people are not established [1]
Blood sugar or cholesterol in healthy people	Early	We found no good trials in healthy adults

Ratings describe how good the research is, not a promise that it will work for you.

What the research says

• Diabetes trials (46 trials). A 2021 review found berberine, used alone or with standard diabetes treatment, was linked to a lower HbA1c (average difference −0.73) and lower fasting blood glucose (−0.86), along with lower triglycerides, LDL cholesterol and BMI [1]. PubMed · DOI
• Review of reviews. An “umbrella review” gathered 11 meta-analyses and found berberine significantly affected blood glucose, insulin resistance, blood lipids, body measures and inflammation markers. It also noted that the quality of the published meta-analyses needs to improve and that the effects need confirming in high-quality trials [2]. PubMed · DOI
• Diabetes, cholesterol and blood pressure (27 trials, 2,569 people). Berberine combined with lifestyle change or usual medicines tended to do better than those alone, and no serious side effects were reported. The authors said overall study quality was limited [3]. PubMed · DOI
• A small head-to-head pilot (36 adults with newly diagnosed diabetes). Over 3 months, berberine’s effect on blood sugar was similar to that of metformin, a standard diabetes medicine. About a third of the people treated had short-lived stomach upsets [4]. PubMed · DOI

Why the caution: reviewers say the quality of the evidence needs improving [2][3], and diabetes results can’t be assumed to apply to healthy people.

Amounts and how people take it

These are amounts used in studies, not recommendations.

• Dose: doses in diabetes trials vary and we did not find one verified standard dose. In the transplant interaction study, people took 0.2 g (200 mg) three times a day for 3 months [5].
• Timing: the sources we checked don’t give a firm rule. The transplant study spread the dose over the day [5].
• Form: check the label for how much berberine each capsule or tablet provides, as products differ.
• Duration: the two studies above that gave a dose lasted about 3 months [4][5]. Long-term safety data are limited.

Side effects, interactions and who should check first

The most common side effects are stomach-related: constipation and diarrhea [2]. In the pilot study, about a third of people treated had short-lived stomach upsets, and no liver or kidney damage was seen [4].

Berberine can change the levels of other medicines. In a trial of 104 kidney-transplant patients, adding berberine (0.2 g three times a day) raised blood levels of the anti-rejection drug cyclosporin A (final levels were about 29% higher than in patients not taking berberine). In a smaller group of six patients, drug exposure rose by about a third. The researchers think berberine blocks an enzyme called CYP3A4 that helps clear many medicines [5]. Other drugs cleared the same way could be affected, though we don’t have verified details on which. Always ask a pharmacist.

Who should check with a doctor or pharmacist first

Check with a doctor or pharmacist first if you:

• take diabetes medicines. In trials, berberine added to diabetes medicines lowered blood sugar further [3], so a dose change may be needed.
• take any prescription medicine, especially transplant or other long-term drugs [5]
• are pregnant or breastfeeding: we did not find reliable safety data, so ask a doctor
• have liver or kidney problems or a long-term condition

Where to buy

Look for the active form and amount (such as berberine hydrochloride, in mg per serving), a stated third-party testing certificate you can check, and work out the price per daily dose rather than comparing pack prices.

FAQ

What is berberine?

Berberine is a natural chemical found in several plants, including barberry and the Chinese herb Coptis [1][6]. Plants containing it have been used in traditional Chinese formulas for a very long time [1], and it is now sold as a supplement. Most research has been in people with type 2 diabetes, not healthy adults [2][3].

Does berberine work?

In reviews of trials in people with type 2 diabetes, berberine was linked to lower blood sugar (HbA1c and fasting glucose), triglycerides, LDL cholesterol and BMI [1]. But many trials are small and of limited quality, and we found no good trials in healthy adults [2][3]. We rate the evidence C: encouraging, with quality gaps.

How much berberine per day?

We didn’t find one verified standard dose. In the kidney-transplant interaction study, people took 200 mg three times a day for 3 months [5], and the two studies that gave a dose lasted about 3 months [4][5]. Check the label for how much berberine each capsule provides. These are amounts used in studies, not recommendations, and long-term safety data are limited.

Who should not take berberine?

Check with a doctor or pharmacist first if you take any prescription medicine, especially transplant or other long-term drugs, if you take diabetes medicines, are pregnant or breastfeeding, or have liver or kidney problems or a long-term condition [3][5]. We found no reliable pregnancy safety data, and berberine raised the blood level of cyclosporin A, a transplant medicine, in a trial [5].

Can you take berberine with metformin?

Ask a doctor or pharmacist first. In one small pilot, berberine’s effect on blood sugar was similar to metformin’s when each was used on its own [4]. In a review, berberine added to usual diabetes medicines lowered blood sugar further [3], so a dose change may be needed. We found no safety study of berberine together with metformin in our sources.

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Talk to your doctor

This page is for general information and is not medical advice. Speak to a doctor or pharmacist before starting any supplement, especially if you are pregnant or breastfeeding, take any medicine, or have a health condition.

References

We cite only studies and official pages we checked against PubMed, the publisher or the agency’s own site. The A to E evidence grades are explained in our editorial policy. See also our medical disclaimer and affiliate disclosure.

1. Guo J, Chen H, Zhang X, et al. The Effect of Berberine on Metabolic Profiles in Type 2 Diabetic Patients: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Oxid Med Cell Longev. 2021. PubMed · DOI
2. Li Z, Wang Y, Xu Q, et al. Berberine and health outcomes: An umbrella review. Phytother Res. 2023. PubMed · DOI
3. Lan J, Zhao Y, Dong F, et al. Meta-analysis of the effect and safety of berberine in the treatment of type 2 diabetes mellitus, hyperlipemia and hypertension. J Ethnopharmacol. 2015. PubMed · DOI
4. Yin J, Xing H, Ye J. Efficacy of berberine in patients with type 2 diabetes mellitus. Metabolism. 2008. PubMed · DOI
5. Wu X, Li Q, Xin H, et al. Effects of berberine on the blood concentration of cyclosporin A in renal transplanted recipients: clinical and pharmacokinetic study. Eur J Clin Pharmacol. 2005. PubMed · DOI
6. Imenshahidi M, Hosseinzadeh H. Berberine and barberry (Berberis vulgaris): A clinical review. Phytother Res. 2019. PubMed · DOI