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Open WellbeingWhat the studies actually measured

Blood sugar and insulin

Berberineand Fasting plasma glucose

All three sources here measured lower fasting plasma glucose.

How sure anyone can be

Moderate certainty, level 3 of 4

Further research may change this.

The most certain of the three findings here; each record carries its own.

The numbers reported

One source’s range, drawn against its own line of no difference and scaled to its own numbers.

-0.72-0.52 mmol/L-0.33

This range stays on one side of the no-difference line.

Bar the confidence interval — the range the true effect is likely to sit inNotch the number the source reportedLine where there would be no difference at all

Three sources, newest first

What we read is the published abstract, not the full paper, so a blank below may still be printed in the paper itself. A fixed rule worked this out from the source’s own fields. Nobody checked this rating by hand.

  • Systematic review, 2025

    Moderate certainty, level 3 of 4

    Efficacy and safety of berberine on the components of metabolic syndrome: a systematic review and meta-analysis of randomized placebo-controlled trials.

    Front Pharmacol. 2025;16:1572197. doi:10.3389/fphar.2025.1572197. PMID:40740996.

    Number reported
    -0.515 mmol/L
    Which way it went
    Lower
    Likely range
    -0.847 to -0.183
    Source’s own words
    mmol/L fasting plasma glucose, weighted mean difference vs placebo
    Who was studied
    Adult with metabolic syndrome
    Compared with
    placebo
    Amount taken
    Not in the abstract
    For how long
    Not in the abstract
    Disagreement between studies
    Not in the abstract
    Kind of record
    Journal article
    How this rating was reachedstarts at High, one step down: imprecision
    1. Starts at High
    2. Imprecision brought it down to Moderatethe abstract does not state how many participants were pooledNot in the abstract
    3. Ends at ModerateOne step down.
    Checked, nothing to step it down for
    risk of bias and indirectness
    Inconsistency
    No disagreement reported, and no count of studies behind it

    Imprecision stops at the first check that applies; others may apply too.

    AI-reviewed & signed — an AI agent re-read this finding against the saved source and checked that the quote, the numbers, the units and the direction match it. No person read it. The owner authorised the agent to sign the batch with the owner's key, and every build rechecks that signature against these exact bytes.

    Read the abstract on PubMed

  • Systematic review, 2024

    Moderate certainty, level 3 of 4

    Effects of administering berberine alone or in combination on type 2 diabetes mellitus: a systematic review and meta-analysis.

    Front Pharmacol. 2024;15:1455534. doi:10.3389/fphar.2024.1455534. PMID:39640489.

    Number reported
    -0.59 mmol/L
    Which way it went
    Lower
    Likely range
    Not in the abstract
    Source’s own words
    mmol/L fasting plasma glucose, mean difference for the berberine-alone pooling (no interval is printed in the abstract)
    Who was studied
    Adult with type 2 diabetes
    Compared with
    control (comparator not detailed in the abstract)
    Amount taken
    900 to 1,500 mg/day berberine (the abstract prints 0.9-1.5 g/d as the MOST COMMON dosage, not the full range)
    For how long
    30 to 90 days
    Disagreement between studies
    Not in the abstract
    Kind of record
    Journal article
    How this rating was reachedstarts at High, one step down: imprecision
    1. Starts at High
    2. Imprecision brought it down to Moderatethe abstract reports no confidence interval for the estimateNot in the abstract
    3. Ends at ModerateOne step down.
    Checked, nothing to step it down for
    risk of bias and indirectness
    Inconsistency
    No disagreement reported, and no count of studies behind it

    Imprecision stops at the first check that applies; others may apply too.

    AI review could not confirm it — an AI agent re-read this finding against the saved source and at least one check failed. The batch record names the check and quotes the sentence that caused the doubt. No person read it.

    Read the abstract on PubMed

  • Systematic review, 2023 · 18 studies pooled · 1,522 participants

    Moderate certainty, level 3 of 4

    Overall and Sex-Specific Effect of Berberine on Glycemic and Insulin-Related Traits: a Systematic Review and Meta-Analysis of Randomized Controlled Trials.

    J Nutr. 2023;153(10):2939-2950. doi:10.1016/j.tjnut.2023.08.016. PMID:37598753.

    Number reported
    -0.52 mmol/L
    Which way it went
    Lower
    Likely range
    -0.72 to -0.33
    Source’s own words
    mmol/L fasting glucose, mean difference vs placebo
    Who was studied
    Adult
    Compared with
    placebo
    Amount taken
    Not in the abstract
    For how long
    Not in the abstract
    Disagreement between studies
    Not in the abstract
    Kind of record
    Journal article
    How this rating was reachedstarts at High, one step down: risk of bias
    1. Starts at High
    2. Risk of bias brought it down to Moderatethe abstract reports no risk-of-bias or quality appraisal, so study limitations cannot be ruled outNot in the abstract
    3. Ends at ModerateOne step down.
    Checked, nothing to step it down for
    indirectness and imprecision
    Inconsistency
    No high disagreement reported between the 18 studies it pooled

    AI-reviewed & signed — an AI agent re-read this finding against the saved source and checked that the quote, the numbers, the units and the direction match it. No person read it. The owner authorised the agent to sign the batch with the owner's key, and every build rechecks that signature against these exact bytes.

    Read the abstract on PubMed

What is still missing from these readings

  • One gives no likely range, so how precise that number is is unknown.
  • Two do not say how many people took part.
  • Amount taken — Two of Three readings: Not in the abstract.
  • For how long — Two of Three readings: Not in the abstract.

Something nobody wrote down is never a zero and never a guess.

Still to read for Berberine

Five of the 14 things on our list for Berberine have no reading here yet:

  • Diastolic blood pressure
  • Interleukin-6
  • Sex hormone binding globulin
  • Systolic blood pressure
  • Total testosterone

Still to read means nobody here has got to it, not that it was tried and did nothing or that no research exists. A pairing on no list is not a gap: we never set out to read it.

Read next

This is a library, not advice. No recommendation, no dose, no diagnosis, no ranking. We never ask about your symptoms, and nothing here is tailored to you.