
What the NIH says about the evidence
- NCCIH reports weak evidence that berberine might help with blood sugar control in people with type 2 diabetes. The studies differ a lot and some are poor quality, so no clear conclusion can be drawn.
- On weight, NCCIH says there is not enough rigorous evidence to know whether berberine works.
- Berberine is not a replacement for any medicine your doctor has prescribed.
Safety
- The most common side effects are stomach pain, constipation, diarrhea and nausea.
- Berberine can interact with medicines. If you take any medicine, talk with your doctor before using it.
- It should not be used during pregnancy or breastfeeding, and should never be given to infants.
Please note: this page is general information, not medical advice. Ask your doctor what is right for you, especially if you have a health condition or take medicine.
Sources
- NCCIH, In the News: Berberine
- NCCIH, Berberine and Weight Loss: What You Need To Know
- NCCIH, Diabetes and Dietary Supplements
Checked November 14, 2026.
