How we rate
“Strong” = several concordant meta-analyses or systematic reviews. “Moderate” = one synthesis, or several controlled trials. “Limited” = early trials only. The rating is about the quality of the studies, not about how useful the supplement is.
Berberine
A plant extract extensively studied for blood sugar and cholesterol, often mistakenly presented as a "natural Ozempic".
Benefits
- Lowers fasting blood glucose and glycated hemoglobin in type 2 diabetes, with an effect comparable to metformin in one trial (meta-analysis of 46 trials)
- Reduces total cholesterol, LDL, and triglycerides, and increases HDL (16 randomized trials)
- Reduces liver fat in non-alcoholic fatty liver disease — more effective than pioglitazone on weight in 184 patients
- Decreases diarrhea, abdominal pain, and urgency in irritable bowel syndrome (196 patients, 8 weeks)
Precautions
Numerous drug interactions: berberine inhibits liver enzymes that break down many medications. Medical advice is essential if undergoing treatment, particularly anti-diabetic or anticoagulant treatment. Not recommended during pregnancy and breastfeeding. Digestive disorders and constipation are frequent. Also good to know: its effect seems to wear off beyond 90 days of use, and the authors of the meta-analyses emphasize that the quality of available trials remains limited. It is not a "natural Ozempic": no trial shows comparable weight loss.
Recommended dosage
300 to 500 mg two or three times a day in trials, i.e., 0.6 to 1.5 g per day, always taken in multiple doses.
How to take it
- Tested doses: from 300 to 500 mg, two or three times a day, i.e., 0.6 to 1.5 g per day. For example, 500 mg three times a day in a trial on fatty liver disease.
- In multiple doses: all the trials in this profile that detail intake split it into two or three doses throughout the day.
- How long: trials last from 30 days to 3 months. In a meta-analysis of 28 studies, the effect on blood sugar wore off beyond 90 days.
- More is not better: in this same meta-analysis, the effect also decreased beyond 2 g per day, and in those over 60 years old.
- With diabetes treatment: the effect on blood sugar was more pronounced in combination with hypoglycemic agents. This is precisely why medical advice is essential if you are undergoing treatment.
What the studies say
This network meta-analysis compared the efficacy of several oral insulin sensitisers, including berberine, in women with polycystic ovary syndrome (PCOS). The study analysed their effects on endocrine and metabolic profiles, as well as on menstrual frequency and hyperandrogenism. Although other treatments showed specific improvements, berberine was included in the general comparison for its role in improving these profiles.
Zhao H, Xing C, Zhang J, He B. — Reproductive health (2021) — View the source study
For information only: not a substitute for medical advice. Dietary supplements are not a replacement for a varied, balanced diet. Learn more