Berberine: weight loss, blood sugar and safety

What is berberine?

Berberine is a substance found in several plants, including barberry and goldenseal, and is sold in supplements. Plant tradition and a biological effect do not establish that every modern product works or is safe. Products and preparations differ; a trial of one does not automatically validate another.1

Can it help with weight or body fat?

Some earlier studies suggest weight or body-mass index may fall, but the US National Center for Complementary and Integrative Health (NCCIH) describes inconsistent results and a high risk of bias in many studies. In a 2026 placebo-controlled trial at 11 hospitals in China, 337 adults with obesity and metabolic dysfunction-associated fatty liver disease, without diabetes, were assigned berberine or placebo for six months. The researchers found no significant between-group difference in their two main outcomes: fat around internal organs and fat in the liver. Both groups received lifestyle support. Average body weight fell by 1.8 kg with berberine and 1.9 kg with placebo; weight was a secondary outcome and the difference was not statistically significant. These results do not establish the effect in every population or product, and they do not rule out all smaller effects.13

Before randomisation, all candidates took the study preparation for 30 days; those who could not tolerate it or did not meet adherence requirements were excluded. Adverse-event rates were similar in the groups that entered the randomized phase, but this selection means that finding cannot describe everyone who starts berberine. The study also reported a larger reduction in LDL cholesterol, a blood marker, in the berberine group. That was a secondary outcome and does not establish fewer heart attacks or strokes. The China Academy of Chinese Medical Sciences Innovation Fund supported the study, and Yunnan Biovalley Pharmaceutical supplied the study products free of charge.3

What about blood sugar?

NCCIH describes a review suggesting that berberine may improve blood glucose measures in people with type 2 diabetes, including as an addition to other treatment. The studies varied, some were poor quality and most participants studied were in China. A change in a blood test is not proof that a supplement prevents complications or replaces established care. Never replace diabetes treatment with an unproven product; speak with the clinician responsible for your care.2

Is it a natural version of Ozempic?

No equivalence has been established. Berberine is a plant-derived compound sold as a supplement; semaglutide is the active ingredient in separately regulated medicines with product-specific evidence and indications. Similar marketing goals do not establish the same mechanism, benefits or safety. Comparing percentages across unrelated trials can mislead because participants and study designs differ. Explore semaglutide products and how to read a trial result.1

Side effects, interactions and uncertainty

Reported effects include nausea, abdominal pain, bloating, constipation and diarrhoea. Berberine can interact with medicines, including ciclosporin, which is used to prevent transplant rejection; ask a pharmacist or clinician about the exact products you take. NCCIH says berberine should not be used during pregnancy or breastfeeding or given to infants. It reports that berberine exposure has been linked to harmful bilirubin buildup in infants, which can cause brain damage. Short trials cannot establish long-term safety. For practical questions, see supplement and medicine interactions and how to read a supplement label.12