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evidence · mechanism · dose
Supplements/Compound

Berberine

Plant alkaloid that activates AMPK — metformin-like effects on glucose and lipids.

Blood Sugar ManagementFat LossCardiovascular HealthGut Health

Overview

An isoquinoline alkaloid extracted from Berberis species. Acts as a potent AMPK activator with effects on glucose, lipids, and gut microbiota.

Natural sources
  • Berberis vulgaris (barberry)
  • Goldenseal
  • Oregon grape
Common forms
  • Berberine HCl
  • Dihydroberberine (better bioavailability)

Forms & variants of Berberine

Different chemical forms of Berberine behave differently. Browse each form's mechanism, bioavailability, and best-use context.

Dihydroberberine (high-bio)
Dihydroberberine

Reduced form of berberine with 5× greater oral bioavailability.

Mechanism of action

Activates AMP-activated protein kinase (AMPK), inhibits mitochondrial complex I, and modulates the gut microbiota.

Pathways
  • · AMPK activation
  • · Mitochondrial complex I inhibition
  • · Gut microbiome modulation
Hormones
  • · Insulin (sensitizes)
Enzymes
  • · AMPK (↑)
  • · PCSK9 (↓)
  • · HMG-CoA reductase (modulates)

Effects on the body

Decreases
Fasting blood glucose
Decreases
HbA1c
Decreases
LDL cholesterol
Decreases
Triglycerides
Supports
Insulin sensitivity

Organ system effects

Liver

Reduces hepatic glucose output; lowers LDL via PCSK9 modulation.

Digestive / Gut

Antimicrobial against pathogenic bacteria; modulates microbiome.

Cardiovascular

Indirect benefit via improved lipid profile and glycemic control.

Evidence-based benefits

Reduces HbA1c comparable to metformin in T2D

Moderate evidence

Reduces LDL cholesterol and triglycerides

Moderate evidence

Improves PCOS metrics (insulin, androgens)

Moderate evidence

Potential side effects

Common
  • · Diarrhea, constipation, gas (very common — start low)
Rare
  • · Headache
Serious
  • · Hypoglycemia when combined with diabetes drugs

Drug interactions

Anti-diabetics (insulin, sulfonylureas)
Additive hypoglycemia risk.
severe
Cyclosporine
Berberine inhibits CYP3A4 — raises cyclosporine levels.
severe
CYP3A4 substrates broadly
Strong CYP3A4 inhibition.
moderate
Anticoagulants
May potentiate via CYP interactions.
moderate

Safety & non-supplemental interactions

Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.

Avoid if you are
  • ·Pregnant (uterine stimulant, kernicterus risk in newborns)
  • ·Breastfeeding
  • ·Neonates
Avoid with these conditions
  • ·G6PD deficiency
  • ·Hypoglycemia tendency
Avoid / monitor with these medications
  • ·Antidiabetic drugs (additive hypoglycemia)
  • ·Cyclosporine, tacrolimus (raised levels — CYP3A4)
  • ·Metformin (additive GI effects)
  • ·Anticoagulants
  • ·Many CYP3A4 / P-gp substrates

Supplement interactions

Pairs well with
  • Milk thistle (silymarin)
    Silymarin increases berberine bioavailability ~5x.
  • Alpha-lipoic acid
    Complementary glycemic support.
Avoid combining with
  • Pregnancy / breastfeeding
    May cause kernicterus in neonates.

Dosing & bioavailability

Typical dose
500 mg × 2–3/day (1,000–1,500 mg total)
Beginner dose
500 mg/day
Study range
900–1,500 mg/day
Upper safe limit
Not formally defined; doses >1.5 g/day not more effective
Best form
Berberine HCl divided across meals; or dihydroberberine for better absorption
Timing
Just before largest carb-containing meals
With food?
With food to reduce GI upset and target post-prandial glucose

Where to buy

Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

Compound
Berberine
Amazon
Wide selection · fast shipping
Compound
Berberine
iHerb
Global delivery · curated brands
Compound
Berberine
Thorne
Practitioner-grade · NSF tested

Scientific evidence (10)

RCTMetabolism · 2008

Efficacy of berberine in patients with type 2 diabetes

Yin J, Xing H, Ye J

RCT, 84 T2D patients, 500 mg berberine TID × 3 months vs metformin.

Key findings

Berberine reduced HbA1c by 2.0% (similar to metformin); also reduced TG and LDL.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — Reduces HbA1c comparable to metformin in T2D

Live PubMed search

Live results for "Berberine Reduces HbA1c comparable to metformin in T2D" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "Reduces HbA1c comparable to metformin in T2D". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — Reduces LDL cholesterol and triglycerides

Live PubMed search

Live results for "Berberine Reduces LDL cholesterol and triglycerides" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "Reduces LDL cholesterol and triglycerides". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — Improves PCOS metrics

Live PubMed search

Live results for "Berberine Improves PCOS metrics" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "Improves PCOS metrics". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — randomized controlled trial

Live PubMed search

Live results for "Berberine randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — meta-analysis

Live PubMed search

Live results for "Berberine meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — pharmacokinetics

Live PubMed search

Live results for "Berberine pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — safety adverse events

Live PubMed search

Live results for "Berberine safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewPubMed (NLM) · 1970

PubMed: Berberine — dose response

Live PubMed search

Live results for "Berberine dose response" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching Berberine and "dose response". Filter by RCT, meta-analysis, or year on the results page.

Open study
Systematic reviewGoogle Scholar · 1970

Google Scholar: Berberine — clinical evidence

Live Scholar search

Cross-database citation index for Berberine as it relates to "clinical evidence".

Key findings

Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

Open study
Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.