Berberine has become one of the fastest-growing supplements in the US, helped by social media posts calling it “nature’s Ozempic”. It’s a plant compound found in goldenseal, barberry and the Ayurvedic herb daruharidra (tree turmeric), and it has been used in Ayurvedic and Chinese medicine for centuries. Here’s what the evidence actually shows.
Is berberine really “nature’s Ozempic”?
No. Medicines like Ozempic and Wegovy (semaglutide) commonly lead to weight loss of around 15% of body weight in trials. Studies of berberine show much smaller effects. Berberine works differently, mainly by influencing how cells use sugar, and it doesn’t copy the appetite-suppressing hormone GLP-1 in the same way.
What studies show
- Weight: reviews of clinical trials suggest berberine may lead to a small extra weight loss of around 2 kg (4 to 5 lb) over several months, compared with a placebo.
- Blood sugar: the strongest evidence is for lowering blood sugar and HbA1c in people with type 2 diabetes or prediabetes.
- Cholesterol: some studies show modest reductions in LDL cholesterol and triglycerides.
Many studies were small, short or of mixed quality, so the results should be treated with caution.
How people take it
Studies typically used 500 mg two or three times a day with meals, up to 1,500 mg a day. Splitting the dose and taking it with food reduces stomach side effects. Follow the directions on the product, and talk to a doctor before starting.
Side effects
- Constipation, diarrhoea, wind and stomach cramps are the most common, especially at higher doses
- Low blood sugar, particularly if combined with diabetes medicine
Drug interactions: important
Berberine affects liver enzymes that break down many medicines. Talk to a doctor or pharmacist before taking it if you take:
- Diabetes medicines, including metformin and insulin
- Blood pressure medicines
- Blood thinners
- Ciclosporin or other immune-suppressing medicines
- Sedatives or any regular prescription medicine
Who should not take berberine
- Pregnant or breastfeeding women: it can harm a baby
- Babies and children
- People with liver disease
The bottom line
Berberine may help a little with blood sugar and weight, but it isn’t a replacement for diet, activity or prescribed treatment. It’s most worth discussing with your doctor if you have prediabetes or high blood sugar. For other approaches, see Ayurvedic herbs for weight loss, fibre for weight loss and weight loss medicines explained.
Frequently asked questions
How long does berberine take to work?
Studies on weight and blood sugar usually lasted 8 to 12 weeks or more. Don’t expect quick results.
Can I take berberine with metformin?
Only with your doctor’s agreement. Both lower blood sugar, and together they can cause low blood sugar or more stomach side effects.
Is berberine safe long-term?
Long-term safety beyond about 6 months isn’t well studied. Use it under a doctor’s guidance if you plan to take it for longer.
More in our Weight Management guide: all our articles on this topic in one place.
This article is for general information only and isn’t a substitute for advice from a doctor or pharmacist. Supplements are not evaluated by the FDA to diagnose, treat, cure or prevent any disease.
