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Herbal / botanical

Berberine

plant alkaloid

A plant compound studied for blood sugar and cholesterol.

Evidence: Moderate

Evidence by use: Moderate for blood sugar and lipids in short trials; limited long-term data. Meta-analyses of randomized trials report lower fasting glucose, HbA1c and LDL cholesterol compared with placebo, but trials are short, often from a small number of countries, and vary in quality.

At a glance

Typical studied dose
Trials commonly use about 500 mg two to three times daily (900-1,500 mg per day) with meals.

Food sources

Plant sources
Barberry, goldenseal, Oregon grape, tree turmeric.

Background and testing

This is not an essential nutrient, so there is no deficiency to diagnose.

Who tends to use it
People with metabolic concerns working with a clinician.
How it is tested
Blood glucose, HbA1c and lipids (managed by a clinician).

Supplement forms

Common forms
Berberine hydrochloride capsules, dihydroberberine, and herbal extracts of berberine-containing plants.
More effective
Berberine HCl at studied doses with meals, from a tested brand, under supervision if taking medicines.
Less effective
Whole goldenseal products as a berberine source (variable and unpredictable); long-term use without monitoring; use alongside diabetes medicines without a clinician.

Safety, interactions and halal notes

Safety and interactions
Common side effects: diarrhea, constipation, gas, stomach cramps. It can lower blood sugar and interact with many medicines (it affects liver enzymes and drug transporters). It is not recommended in pregnancy or breastfeeding.
Who should avoid it or ask a clinician first
Pregnant and breastfeeding women, newborns, people with low blood sugar, and anyone on diabetes, blood-pressure, cyclosporine or other prescription medicines.
Halal note
Plant-derived. Check capsule shells.

Frequently asked questions

Is berberine like metformin?

Some studies compare effects, but berberine is not a replacement for prescribed treatment and has drug-interaction risks.

Sources

  1. Efficacy and Safety of Berberine Alone for Several Metabolic Disorders: A Systematic Review and Meta-Analysis (PMC 8107691)

← Back to the full nutrient guide

This page is for education only and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Supplements are not intended to diagnose, treat, cure or prevent any disease. Talk to a qualified clinician before starting a supplement, especially if you are pregnant, breastfeeding, take medicine or have a medical condition. Daily needs are US reference intakes for adults 19-50.

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