INSYGMA NUTRITIONProduct science / Berberine
Berberine 500 mg · 3 times a day
The science of berberine
What the studies measured and what they found.
Randomized trials only
In the trials, berberine lowered blood sugar and cholesterol a little.
Only studies in which chance decides who takes berberine count here. In those, blood sugar and cholesterol fell a little, and bowel polyps came back less often. Other conditions were barely measured.
- 7 of 27
- benefits graded A or B
- 6 of 27
- results with no clear effect or with varied results
What is best confirmed
- BGood results Lower blood sugar Especially in people with diabetes Small decrease
- BGood results Lower LDL cholesterol About 18 mg/dL on average Small decrease
- AWell proven Fewer polyps come back In people who had already had polyps 36% versus 47%
The dose: in 27 of the 35 trials that stated a dose, the dose was 900 to 1,500 mg a day. This product provides 1,500 mg a day. See the doses and forms tested
See all 27 resultsBerberine / Evidence in humans
How to read the grades, arrows and counts
The arrow shows the direction of the measure: down when the measure fell, for example pain. It turns green when the change is an improvement. When the size was assessed, 1, 2 or 3 filled arrows mean a small, moderate or large effect. The = sign means no clear difference.
Few studies: only 1 or 2 controlled trials measured this result. Mixed results: the trials disagree.
When sorting by effect, the result with the largest magnitude in each topic counts. In a tie, the better grade of that result counts first, then alphabetical order. “Largest improvement with berberine” considers benefits in comparisons where the effect of berberine can be isolated. “Largest measured effect” also includes markers and combined treatments.
The grade says how well it works: A, it works and is well studied; B, good results; C, few studies (only 1 or 2 controlled trials measured this result) or mixed results (the trials disagree); D, no clear effect. For safety, A and B mean it does not increase risk, C that there are doubts and F that it increases risk. The grade comes from fixed rules: the size of the effect in the main review, the number of trials and people, and the agreement between trials.
The three arrows point in the direction of the measure. For example, a shorter walking time points down. When the record documents the magnitude, one, two or three dark arrows correspond to a small, moderate or large effect. For other changes, one dark arrow shows only the direction. For standardized mean differences, the descriptive benchmarks are 0.2, 0.5 and 0.8 in absolute value.
The = sign means the test did not detect a difference. “Varied results” means the results diverged between studies, tests or time points. For case reports, the table states what was observed. The counts are of publications; one trial can give rise to several articles.
The records summarize the published abstract of each article; when the full text was read, the record says so. This is a targeted selection, not a new systematic review; only trials in which berberine is the only difference between the groups are included.
| Topic | Measured result | Grade | Effect | Evidence |
|---|
Doses and formsAnd the “enhanced absorption” forms More absorption has not yet shown more effect See details
What was tested?
- Trials that stated a dose
- 35
- With 1,500 mg a day
- 6
The trials use ordinary berberine, almost always without stating its source. In 12 adults, emulsified berberine gave about 2 to 4 times more berberine in the blood than powdered berberine. In 5 men, 100 mg of dihydroberberine raised blood berberine more than 500 mg of ordinary berberine, but blood sugar did not change with either. It is not known whether more berberine in the blood gives more effect.
See the studies on the formsSide effectsWhat shows up in the trials Some stomach complaints, no serious effects See details
What shows up most?
In 16 placebo-controlled trials that counted side effects, there were no serious effects with berberine. Stomach complaints were slightly more frequent (for example, 22.7% versus 14%), and 2 to 6% stopped because of them. In the polyp trial, the most common complaint was constipation (6 in 446, versus 1 in 478). In the largest and most recent trial, serious effects were 6 in 169 with berberine and 2 in 168 with placebo, with no clear difference. Outside the trials there are isolated cases, which do not prove that berberine was the cause: 2 reports of serious heart rhythm disturbances (torsades de pointes), one of them together with other supplements, which disappeared after stopping, and 1 athletic man who fainted with very low blood sugar (0.9 mmol/L) after taking berberine and exercising.
Practical advice: if stomach complaints do not go away, talk to your pharmacist. If you have a known heart rhythm problem, talk to your doctor before taking berberine.
See the safety studiesMedicinesCiclosporin and others People who take medicines should talk to their doctor first See details
Why does it matter?
In a crossover trial, 300 mg of berberine three times a day for 2 weeks slowed liver enzymes that clear many medicines (CYP2D6, CYP2C9 and CYP3A4); exposure to midazolam rose by about 40%. In 104 transplant patients, blood ciclosporin was about 29% higher with berberine. People who take medicines every day should talk to their doctor or pharmacist first.
See the studies with medicinesFrequently Asked Questions
Does it prevent diabetes?
Not measured yet.
In the trials, berberine lowered blood sugar in lab tests. No completed trial has yet measured new cases of diabetes: a trial in China with 2,024 people is measuring this and ends at the end of 2026.
See the trial registrationDoes it help with weight loss?
A little.
In 15 trials, weight fell by less than 1 kg on average. In the largest and most recent trial, belly fat and liver fat did not fall more than without berberine.
See the weight studiesDoes it replace diabetes or cholesterol medicines?
No.
In the trials, the decreases were small: LDL fell by about 18 mg/dL. Do not stop or change medicines without talking to your doctor. Berberine also affects the levels of some medicines.
See the cholesterol studiesHow is it taken in the studies?
In 2 or 3 doses.
In 27 of the 35 trials that stated a dose, the dose was 900 to 1,500 mg a day, split over the day. The most common complaints were stomach-related, with no serious effects.
See the side effectsINSYGMA Labs · 11 November 2026 · Back to top ↑