Berberine is getting more and more attention as the next miracle supplement, promoted for its cardiovascular and metabolic benefits, especially in people with diabetes, heart disease, and high cholesterol. Some also take it for its anti-inflammatory effects or as an immune boost that helps fight viral or parasitic infections.
In this article, I'll go over which of these claimed benefits actually have evidence to support them. I'll also talk about who should, and more importantly, who should not be taking berberine, and go over its safety profile.
Hi, I'm Dr. Leonid Kim, and I share the most up-to-date, evidence-based information on metabolic health, weight loss, and longevity. Let's get into it.
What Is Berberine?
Berberine is an alkaloid derivative that can be isolated from many kinds of medicinal plants. It's been used in traditional Chinese and Ayurvedic medicine for thousands of years, with applications ranging from diarrhea to type 2 diabetes and even certain cancers. Animal studies have shown additional benefits, including weight loss, improvements in gut health and inflammation, and treatment of fatty liver and heart failure.
Berberine's Effects on Blood Glucose
One of the most studied effects of berberine is its impact on glucose metabolism and cholesterol levels. A meta-analysis of 27 randomized controlled trials, including over 2,500 patients, showed that berberine has effects on type 2 diabetes comparable to those of other therapeutic regimens.
More specifically, one study of 36 adults with newly diagnosed diabetes compared the effects of berberine versus metformin and found that berberine reduced hemoglobin A1c by two percentage points, similar to the change seen in the metformin group. In fact, compared with metformin, berberine showed a nearly identical effect on fasting blood glucose levels and on fasting and postprandial insulin levels. Regarding cholesterol, the berberine group showed significantly lower triglyceride levels than the metformin group.
A subsequent study of 97 patients with diabetes found that berberine lowered fasting blood glucose by 28%, similar to the effects observed in the subgroup treated with metformin or the diabetes medication rosiglitazone (brand name Avandia). This study also noted a decrease in insulin levels among patients treated with berberine, suggesting improved insulin sensitivity.
Berberine's Effects on Cholesterol
When it comes to cholesterol, berberine also seems to be quite beneficial in treating lipid disorders. A small, randomized, placebo-controlled, double-blind study of 106 subjects with type 2 diabetes and dyslipidemia found that 12 weeks of berberine treatment not only improved blood glucose and triglyceride levels but also lowered LDL levels by 21%. This finding is consistent with an older study published in Nature, which found that berberine decreased LDL by 25%.
There was also an interesting study published in Metabolism that conducted a head-to-head comparison between berberine and simvastatin, a common statin. They found that the group treated with berberine had a much greater LDL reduction than the simvastatin group. On top of that, the combination therapy of simvastatin plus berberine gave an even greater reduction in LDL, at a whopping 31%.
Lastly, recent animal studies have highlighted that berberine has weak activity in inhibiting PCSK9, an enzyme targeted by a newer class of cholesterol medications such as evolocumab (brand name Repatha). Other studies note that berberine modulates the microbiome, thereby promoting metabolic health by increasing GLP-1 levels. The same hormone underlies the wildly popular weight-loss and diabetes drugs like Ozempic and Mounjaro.
Who Should and Shouldn't Take Berberine
Now, let's discuss who should and should not be taking this supplement. Is this a good supplement for someone who has diabetes or cholesterol problems?
Despite the impressive studies mentioned above, they are still tiny compared with the studies published on most diabetes and cholesterol medications. So I personally would still favor common medications like metformin or a statin over berberine.
The number of people studied while taking these prescription medications far outweighs the small studies that looked into berberine. The formulation of prescription drugs is also highly regulated, unlike what you see in the supplement industry, where it's often hard to know for sure if the product you're buying contains the right therapeutic dose and actually contains the medicinal components advertised.
That said, if you are, for whatever reason, unable to take common oral diabetes medications or statins, it may be worth talking to your doctor about whether berberine can be added to your treatment regimen. Just be aware that there's still not a whole lot of information about how berberine interacts with other medications, so your doctor may be more comfortable recommending berberine if you do not have any major comorbidities or if it's the only medication you'll be taking.
However, given the limited drug interaction data available, I personally would not recommend it to someone who takes more than three or four drugs or supplements, especially ones that require close monitoring, like blood thinners or cardiac medications.
Conclusion
Berberine has real, evidence-backed effects on blood sugar and cholesterol, with some studies showing it performs comparably to established medications like metformin and simvastatin. That said, the body of research behind berberine is still small compared to decades of large-scale trials on prescription diabetes and cholesterol medications, and supplement quality and dosing are far less regulated. For most people with diabetes or high cholesterol, standard prescription treatments remain the better-supported first choice. Berberine may be worth discussing with your doctor as an addition or alternative in specific situations, particularly for those who can't tolerate standard medications. Still, caution is warranted for anyone on multiple medications due to the limited data on drug interactions.
FAQ
What is berberine?
Berberine is a plant-derived alkaloid used for thousands of years in traditional Chinese and Ayurvedic medicine, historically used for conditions ranging from diarrhea to diabetes.
Does berberine actually lower blood sugar?
Yes. Multiple studies, including a meta-analysis of 27 randomized controlled trials, show that berberine can lower blood glucose and hemoglobin A1c to levels comparable to those of medications like metformin.
Can berberine lower cholesterol?
Yes. Several studies show that berberine can meaningfully reduce LDL cholesterol and triglycerides, with some research indicating effects comparable to or better than those of statins like simvastatin, especially when combined with a statin.
Is berberine as good as prescription medications like metformin or statins?
The evidence is promising, but the studies on berberine are much smaller in scale than the extensive research behind standard prescription medications. Supplement quality and dosing are also far less regulated than prescription drugs, so most doctors and this author still favor established medications as the first choice.
Who should be cautious about taking berberine?
People taking multiple medications, especially those requiring close monitoring like blood thinners or cardiac medications, should be cautious, since drug interaction data on berberine is limited. It's best to discuss it with a doctor beforehand.
Who might consider berberine as an option?
Those who cannot tolerate standard diabetes or cholesterol medications, or who have few other comorbidities and medications, may be reasonable candidates to discuss berberine with their doctor as part of their treatment plan.