What is the recommended dose of Berberine?

- **Standard dose:** 900-2,000mg/day, divided into 3-4 doses - **Take with meals** (uses post-meal glucose spike) - **Start low to reduce GI effects.** Too much at once = stomach upset, diarrhea. -...

Is Berberine safe to take daily?

Berberine is rated "Prescription Interactions" based on clinical evidence. - **Very common:** Stomach pain, nausea, vomiting, diarrhea, constipation, flatulence - **Less common:** Dizziness, drowsiness, fatigue, headache

Does Berberine interact with any medications?

Berberine has 6 known drug interactions, including interactions with CYP3A4 substrate drugs (statins, CCBs, HIV meds, many others), CYP2D6 substrate drugs (metoprolol, fluoxetine, codeine), BP-lowering drugs. Check with your doctor before combining with prescription medications.

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Ingredient Research

Graded against 173,636 supplements + 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, NIH DSLD

Berberine

STRONG EVIDENCEBotanicalLast updated April 5, 2026

AVELOR SUMMARY

Berberine is a plant alkaloid with blood-sugar-lowering potency that rivals some prescription diabetes medications. Our research, from 6 RCTs, 12 meta-analyses, and 33,646 participants, shows strong evidence for reducing blood glucose, HbA1c, total cholesterol, and triglycerides — particularly in type 2 diabetes and PCOS. It's a serious bioactive compound, not a casual supplement. The key safety issue: it inhibits CYP3A4, CYP2D6, and CYP2C9 enzymes, creating drug interactions with a huge range of medications.

EVIDENCE GRADES

Total CholesterolStrong

Blood Glucose (T2D)Large improvement

HbA1c (T2D)Large improvement

TriglyceridesModerate

LDL CholesterolModerate

Blood PressureModerate

Insulin ResistanceModerate

OPTIMAL DOSAGE

Standard dose: 900-2,000mg/day, divided into 3-4 doses
Take with meals (uses post-meal glucose spike)
Start low to reduce GI effects. Too much at once = stomach upset, diarrhea.
Bioavailability: Only ~5% absorbed. Enhanced formulations (liposomal, micelle) increase absorption 6x+ but also amplify drug interactions.

Scan a supplement containing Berberine

DRUG INTERACTIONS

CYP3A4 substrate drugs (statins, CCBs, HIV meds, many others)Severe

Increases drug levels

Monitor drug levels. Genetic susceptibility varies.

CYP2D6 substrate drugs (metoprolol, fluoxetine, codeine)Moderate

Increases drug levels

Monitor.

BP-lowering drugsModerate

Additive BP reduction

Monitor BP.

Blood-glucose-lowering drugsMinor

Additive glucose reduction

Monitor blood glucose.

CYP2C9 substrates (warfarin, phenytoin)Unknown

May increase drug levels

Monitor if combining.

Blood thinnersUnknown

Theoretical bleeding risk

Unlikely clinically significant.

SAFETY PROFILE

Side Effects

Very common: Stomach pain, nausea, vomiting, diarrhea, constipation, flatulence
Less common: Dizziness, drowsiness, fatigue, headache

Drug Interactions

Precautions

Pregnancy: AVOID. Can initiate uterine contractions (miscarriage risk). May cause bilirubin toxicity in infants (jaundice, kernicterus).
Breastfeeding: AVOID. Passes into breast milk. Same bilirubin toxicity concerns.
Diabetes: Monitor closely — additive blood sugar reduction. Not a substitute for medical care.
Enhanced-bioavailability formulations: Amplify both effects AND drug interactions. Use with extra caution.

Quality Concerns

Studies in US and France found berberine supplements frequently don't contain labeled amounts. Third-party testing recommended.

WADA Status

Not Prohibited.

WHO SHOULD BE CAREFUL

QUALITY CONCERNS

Studies in US and France found berberine supplements frequently don't contain labeled amounts. Third-party testing recommended.

HOW AVELOR SCORES THIS

Present at 500-1,500mg:✅ Green flag for metabolic health — strong evidence base

In someone on diabetes medications:⚠️ Yellow flag — additive glucose-lowering, needs monitoring

In someone on CYP3A4 medications (statins, etc.):🔴 Red flag — documented toxic drug level increases

During pregnancy:🔴 Red flag — contraindicated

Enhanced bioavailability form + medications:🔴 Red flag — amplified interaction risk

RELATED RESEARCH

Apigenin

ApigeninChamomile extract

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ArjunaArjuna bark

Scan Your Berberine Supplement Browse all ingredients

Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated: April 5, 2026

Not medical advice. Based on published clinical research and systematic reviews.

Berberine · interaction landscape

7 flagged

Dangerous

Moderate

Timing

Pre-op

Safety

Berberine: Drug Interactions

Discuss with prescriber

Clinically significant interactions per published research. Talk to your prescriber or pharmacist before using this supplement if you take any of these.

Metformin
Berberine and metformin lower blood glucose via similar pathways.
RiskSevere hypoglycemia.
ActionStart at 500mg berberine. Monitor glucose closely. Metformin dose may need to be reduced.
SourcePMID: 37439907
Cyclosporine
Berberine inhibits CYP3A4 and P-glycoprotein, dramatically increasing cyclosporine levels.
RiskCyclosporine toxicity (nephrotoxic).
ActionNever combine without transplant team supervision.
SourceClinical pharmacology

Use with caution

Moderate interactions. Monitoring, timing separation, or dose adjustment may be required.

CYP2D6 substrates (codeine, tramadol, many antidepressants)
Berberine inhibits CYP2D6.
RiskIncreased drug levels.
ActionMonitor for side effects.
SourcePMID: 38928095
CYP3A4 substrates (statins, calcium channel blockers)
Berberine inhibits CYP3A4.
RiskIncreased drug levels and potential toxicity.
ActionUse caution with narrow-therapeutic-index drugs.
SourcePMID: 37439907
Sulfonylureas (glipizide, glyburide)
Additive glucose lowering.
RiskHypoglycemia.
ActionMonitor blood sugar closely.
SourceClinical consensus
Blood pressure medications
Berberine may lower BP.
RiskHypotension.
ActionMonitor BP.
SourceClinical consensus
Anticoagulants
Berberine may have antiplatelet effects.
RiskBleeding risk.
ActionMonitor if combining.
SourceLimited evidence

Educational information only. This is not medical advice. These statements have not been evaluated by the FDA. Talk to your prescriber before starting, stopping, or combining any supplement with prescription medication.

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Ingredient Research

Graded against 173,636 supplements + 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, NIH DSLD

Berberine

STRONG EVIDENCEBotanicalLast updated April 5, 2026

AVELOR SUMMARY

EVIDENCE GRADES

Total CholesterolStrong

Blood Glucose (T2D)Large improvement

HbA1c (T2D)Large improvement

TriglyceridesModerate

LDL CholesterolModerate

Blood PressureModerate

Insulin ResistanceModerate

OPTIMAL DOSAGE

Standard dose: 900-2,000mg/day, divided into 3-4 doses
Take with meals (uses post-meal glucose spike)
Start low to reduce GI effects. Too much at once = stomach upset, diarrhea.
Bioavailability: Only ~5% absorbed. Enhanced formulations (liposomal, micelle) increase absorption 6x+ but also amplify drug interactions.

Scan a supplement containing Berberine

DRUG INTERACTIONS

CYP3A4 substrate drugs (statins, CCBs, HIV meds, many others)Severe

Increases drug levels

Monitor drug levels. Genetic susceptibility varies.

CYP2D6 substrate drugs (metoprolol, fluoxetine, codeine)Moderate

Increases drug levels

Monitor.

BP-lowering drugsModerate

Additive BP reduction

Monitor BP.

Blood-glucose-lowering drugsMinor

Additive glucose reduction

Monitor blood glucose.

CYP2C9 substrates (warfarin, phenytoin)Unknown

May increase drug levels

Monitor if combining.

Blood thinnersUnknown

Theoretical bleeding risk

Unlikely clinically significant.

SAFETY PROFILE

Side Effects

Very common: Stomach pain, nausea, vomiting, diarrhea, constipation, flatulence
Less common: Dizziness, drowsiness, fatigue, headache

Drug Interactions

Precautions

Pregnancy: AVOID. Can initiate uterine contractions (miscarriage risk). May cause bilirubin toxicity in infants (jaundice, kernicterus).
Breastfeeding: AVOID. Passes into breast milk. Same bilirubin toxicity concerns.
Diabetes: Monitor closely — additive blood sugar reduction. Not a substitute for medical care.
Enhanced-bioavailability formulations: Amplify both effects AND drug interactions. Use with extra caution.

Quality Concerns

Studies in US and France found berberine supplements frequently don't contain labeled amounts. Third-party testing recommended.

WADA Status

Not Prohibited.

WHO SHOULD BE CAREFUL

QUALITY CONCERNS

Studies in US and France found berberine supplements frequently don't contain labeled amounts. Third-party testing recommended.

HOW AVELOR SCORES THIS

Present at 500-1,500mg:✅ Green flag for metabolic health — strong evidence base

In someone on diabetes medications:⚠️ Yellow flag — additive glucose-lowering, needs monitoring

In someone on CYP3A4 medications (statins, etc.):🔴 Red flag — documented toxic drug level increases

During pregnancy:🔴 Red flag — contraindicated

Enhanced bioavailability form + medications:🔴 Red flag — amplified interaction risk

RELATED RESEARCH

Apigenin

ApigeninChamomile extract

Apocynum Venetum

ArjunaArjuna bark

Scan Your Berberine Supplement Browse all ingredients

Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated: April 5, 2026

Not medical advice. Based on published clinical research and systematic reviews.

Berberine · interaction landscape

7 flagged

Dangerous

Moderate

Timing

Pre-op

Safety

Berberine: Drug Interactions

Discuss with prescriber

Clinically significant interactions per published research. Talk to your prescriber or pharmacist before using this supplement if you take any of these.

Metformin
Berberine and metformin lower blood glucose via similar pathways.
RiskSevere hypoglycemia.
ActionStart at 500mg berberine. Monitor glucose closely. Metformin dose may need to be reduced.
SourcePMID: 37439907
Cyclosporine
Berberine inhibits CYP3A4 and P-glycoprotein, dramatically increasing cyclosporine levels.
RiskCyclosporine toxicity (nephrotoxic).
ActionNever combine without transplant team supervision.
SourceClinical pharmacology

Use with caution

Moderate interactions. Monitoring, timing separation, or dose adjustment may be required.

CYP2D6 substrates (codeine, tramadol, many antidepressants)
Berberine inhibits CYP2D6.
RiskIncreased drug levels.
ActionMonitor for side effects.
SourcePMID: 38928095
CYP3A4 substrates (statins, calcium channel blockers)
Berberine inhibits CYP3A4.
RiskIncreased drug levels and potential toxicity.
ActionUse caution with narrow-therapeutic-index drugs.
SourcePMID: 37439907
Sulfonylureas (glipizide, glyburide)
Additive glucose lowering.
RiskHypoglycemia.
ActionMonitor blood sugar closely.
SourceClinical consensus
Blood pressure medications
Berberine may lower BP.
RiskHypotension.
ActionMonitor BP.
SourceClinical consensus
Anticoagulants
Berberine may have antiplatelet effects.
RiskBleeding risk.
ActionMonitor if combining.
SourceLimited evidence

Discover More

Helps With

Blood Sugar Diabetes Weight Loss Gut Health

Related Ingredients

Chromium Alpha Lipoic Acid Cinnamon

Explore

Browse All 834 Ingredients Browse All 20 Conditions