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Supplements

Berberine

A plant alkaloid with short-term glucose and lipid signals, limited by uneven trial quality, gastrointestinal effects, and broad interaction potential.

Emerging
Evidence rating
Evidence review

What the evidence says

Berberine is an alkaloid found in barberry, goldenseal, and related plants. Reviews in type 2 diabetes report lower fasting glucose and HbA1c, including a 2022 meta-analysis estimating an average HbA1c reduction near 0.6 percentage points, but most studies were short and many were conducted in China.[1][2]

A placebo-controlled lipid meta-analysis of 18 studies found modest reductions in LDL cholesterol and triglycerides over 4 to 24 weeks. These biomarker changes do not show that berberine prevents heart attack, stroke, kidney disease, or other diabetes complications, and it should not be presented as a natural equivalent to any single prescription drug.[3]

Product and dose differences matter because supplements may contain berberine from different plants or extracts. NCCIH describes possible adjunctive benefit but highlights variable effects and poor-quality studies; substituting it for proven diabetes or lipid treatment can delay effective care.[4][1]

Nausea, diarrhea, bloating, and constipation are common. Berberine can affect drug transporters and metabolizing enzymes, creating interaction risk across many medicines. It should be avoided during pregnancy and breastfeeding and not given to infants because bilirubin displacement can contribute to severe neurologic injury.[4][5]

Potential benefits

  • May modestly improve fasting glucose and HbA1c as an adjunct in type 2 diabetes.[1][2]
  • May modestly lower LDL cholesterol and triglycerides over the short term.[3]

Side effects and cautions

  • Commonly causes nausea, diarrhea, constipation, bloating, or abdominal discomfort.[4]
  • Has meaningful medicine-interaction potential and should be avoided in pregnancy, breastfeeding, and infancy.[5][4]
How we scored it

Evidence breakdown

Meta-analyses suggest modest improvements in HbA1c and lipids, but many trials are small, geographically concentrated, heterogeneous, and do not test cardiovascular outcomes.

Clinical relevanceModerate

Studies measure glucose, HbA1c, and lipids, but rarely symptoms or clinical events.

Study qualityLow

Many trials have short follow-up, inconsistent products, and risk-of-bias concerns.

Safety dataLow

Common gastrointestinal effects are known, while interactions and vulnerable-population risks are incompletely mapped.

References

Full source list

  1. Efficacy and safety of berberine in type 2 diabetes mellitus: a systematic review and meta-analysis

    Frontiers in Pharmacology · 2021

  2. Efficacy and safety of berberine alone or combined with antidiabetic drugs in type 2 diabetes

    Oxidative Medicine and Cellular Longevity · 2022

  3. The effects of berberine supplementation on cardiovascular risk factors in adults: a systematic review and meta-analysis

    Frontiers in Nutrition · 2023

  4. Diabetes and Dietary Supplements: What You Need To Know

    National Center for Complementary and Integrative Health · 2025

  5. Opinion on the safety of use of berberine-containing plants in food supplements

    French Agency for Food, Environmental and Occupational Health and Safety · 2019