Berberine: what the evidence says about blood sugar, weight and safety
Berberine explained: what research shows for blood sugar, cholesterol and weight, why it is not nature's Ozempic, side effects, and who should avoid it.
The short answer
Berberine is a plant compound sold as a supplement. Some evidence shows a modest effect on blood sugar and cholesterol. There is not enough rigorous evidence for weight loss; it is not nature's Ozempic.
- It causes digestive side effects, may interact with medicines, and is not for pregnancy.
Berberine is a yellow plant compound sold as a supplement and promoted online as "nature's Ozempic." Research suggests it can modestly lower blood sugar and cholesterol, but the evidence for weight loss is limited, and it is not a substitute for prescription weight-loss medicines. It also causes digestive side effects and can interact with medicines. Here is what berberine is, what the evidence says, who should avoid it, and what to ask your doctor before trying it.
General information, not medical advice. Talk to your doctor or pharmacist before taking berberine, especially if you take diabetes, blood pressure or other prescription medicines.
What is berberine?
According to the National Center for Complementary and Integrative Health (NCCIH), berberine is a chemical found in several plants, including European barberry, goldenseal, goldthread, Oregon grape, phellodendron and tree turmeric. It has a long history in traditional Chinese and Ayurvedic medicine and is now sold as a dietary supplement, usually in capsules.
What does the research say about berberine?
| Use | Evidence | Summary |
|---|---|---|
| Blood sugar in type 2 diabetes | Some evidence | A modest lowering effect, according to NCCIH |
| Cholesterol | Limited evidence | May reduce cholesterol levels |
| Blood pressure | Limited evidence | May add benefit alongside the drug amlodipine |
| Weight loss | Not enough rigorous evidence | Early studies are promising; few clinical trials |
Source: NCCIH, In the News: Berberine (updated June 2023).
A 2023 umbrella review in Phytotherapy Research pooled 11 meta-analyses of randomized trials. It found that berberine significantly affected blood glucose, insulin resistance, blood lipids, body measurements, and inflammatory markers compared with control groups. But the authors also noted that the methodological quality of these analyses needed improvement and that the effects need to be confirmed in high-quality trials. Many of the original studies were small, short, and run in people with diabetes or metabolic conditions, not in healthy women hoping to lose weight.
Is berberine "nature's Ozempic"?
No. The nickname comes from social media, not from research. Prescription GLP-1 medicines such as semaglutide have been tested in large, long trials and produce substantial weight loss. Berberine has nowhere near that evidence: NCCIH says there is not enough rigorous scientific evidence to determine whether it is effective for weight loss. At best, studies suggest small changes in body measurements, mostly in people with metabolic conditions.
Side effects of berberine
NCCIH says berberine is generally well tolerated when taken by mouth, but it is not without risks. The most common side effects are digestive:
- Abdominal pain
- Constipation
- Diarrhea
- Nausea
- Vomiting
The 2023 umbrella review also found constipation and diarrhea to be the most common side effects across trials.
Who should not take berberine?
- Pregnant or breastfeeding women: NCCIH says they should not use berberine.
- Infants: berberine should not be given to babies; it can cause or worsen jaundice in newborns and could lead to a serious condition called kernicterus.
- People on medicines: NCCIH warns berberine might interact with medicines in negative ways. Ask a pharmacist, especially if you take diabetes drugs, blood pressure medicine, blood thinners, or medicines processed by the liver.
- People with diabetes: combining berberine with glucose-lowering medicines may push blood sugar too low; never swap a prescribed medicine for a supplement.
How is berberine usually taken?
In studies, berberine is often taken in divided doses with meals, which may also reduce stomach upset. There is no official recommended dose, and supplements are not reviewed by the FDA for safety or effectiveness before they are sold, so product strength and quality vary. If you and your doctor decide to try it, choose a product with third-party testing, start with a low dose, and stop if you have side effects.
Questions to ask your doctor
- Could berberine interact with any medicine I take?
- Do my blood sugar or cholesterol levels need treatment, and what is proven to work?
- Should I check my blood sugar or blood tests while taking it?
- Is there a better first step for my goals, such as diet, activity or a prescription option?
What helps blood sugar and weight with stronger evidence
- Fiber: slows the rise in blood sugar after meals; see our guide to fiber supplements.
- Movement after meals: even a 10-minute walk helps; see walking pads and daily steps.
- Strength training, which improves how muscles use glucose.
- Sleep and stress: see how to lower cortisol and magnesium for sleep.
- Gut health: see our gut health guide.
- Perimenopause: weight and blood sugar often shift in midlife; see perimenopause symptoms.
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Questions people ask about this
What is berberine?
A yellow chemical found in plants such as goldenseal, European barberry and Oregon grape, used in traditional medicine and sold as a dietary supplement.
Does berberine help you lose weight?
There is not enough rigorous evidence to say, according to NCCIH. Early studies are promising, but there are few clinical trials, and effects appear small.
Is berberine nature's Ozempic?
No. The nickname comes from social media. Prescription GLP-1 medicines have far stronger evidence for weight loss than berberine.
Does berberine lower blood sugar?
There is some evidence of a modest blood sugar-lowering effect in people with type 2 diabetes. Never use it in place of prescribed medicine.
What are the side effects of berberine?
Mostly digestive: abdominal pain, constipation, diarrhea, nausea and vomiting. It can also interact with medicines.
Who should not take berberine?
People who are pregnant or breastfeeding, infants, and anyone taking medicines without first checking with a doctor or pharmacist.
