Compound or practice · Supplement
Berberine
A plant alkaloid that behaves like a metabolic drug — real glucose and lipid effects, and it deserves drug-level caution.
- Overall grade
- Grade B
- Last revised
- 2
- graded outcomes
- 0
- references listed
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
3 at grade B — 3 graded rows
What is known
Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.
- Fasting glucose / HbA1cEvidence grade B
Meaningful reductions
Moderatehigh
- LDL / triglyceridesEvidence grade B
Modest lowering
Smallhigh
Conditions
How the entry reads its effect on diagnosed conditions: the direction first, then the grade. Never a substitute for the person who treats you.
- Type 2 diabetes / prediabetes May improveEvidence grade BAdjunct, with careGrade B
What is uncertain
Read off the same rows as above. Nothing here is added that the entry does not itself record.
- Caution with Metformin: Additive glucose lowering — hypoglycemia risk; monitor.
- Watch with Psyllium Husk: Fiber slows uptake — separate by 2 hours.
Interactions
Documented pairings with supplements and medicines. A medicine on this list is a conversation for whoever prescribes it.
MetforminCaution
Additive glucose lowering — hypoglycemia risk; monitor.
Psyllium HuskMind the timing
Fiber slows uptake — separate by 2 hours.
The evidence in words
What it is
Berberine is an alkaloid from several plants (goldenseal, barberry) with pharmacologic effects on glucose and lipid metabolism rivaling some prescription agents.
How it works
It activates AMPK, the cellular energy sensor, improving insulin sensitivity, reducing hepatic glucose output, and modestly lowering LDL and triglycerides — a mechanism it shares conceptually with metformin.
What the evidence shows
Meta-analyses show meaningful reductions in fasting glucose, HbA1c, and lipids, comparable in some trials to oral hypoglycemics. Poor oral bioavailability limits it, and GI upset is common. Because it acts like a drug, it stacks (dangerously) with glucose-lowering medication and interacts via CYP enzymes.
How to use it
500 mg 2–3× daily with carbohydrate-containing meals; give it several weeks. Consider dihydroberberine for better absorption.
Safety & interactions
GI upset is common. Treat it as a drug: additive hypoglycemia with diabetes medication, CYP-mediated interactions, and avoid in pregnancy/nursing. metformin — Additive glucose lowering — hypoglycemia risk; monitor. Psyllium Husk — Fiber slows uptake — separate by 2 hours.
Bottom line
The closest thing to a metabolic drug on the supplement shelf — real glucose and lipid benefits. Respect it accordingly: with meals, several weeks, and never casually alongside diabetes medication.
How it is used
As the entry records it, from the studies it summarises. Not a recommendation for you — doses that suit a trial population may not suit you.
- Standard
- 500 mg 2–3×/day with carb meals.
Related reading
Entries that share this one's tags or conditions.
- Berberine for Fasting glucose / HbA1cEvidence grade B — Meaningful reductionsEvidence grade B
- Berberine for LDL / triglyceridesEvidence grade B — Modest loweringEvidence grade B
- Berberine for Type 2 diabetes / prediabetesEvidence grade B — Adjunct, with careEvidence grade B
- Berberine: dosage and how to take it500 mg 2–3×/day with carb meals.Evidence grade B
Sources
This entry lists no references of its own.
Last revised . A grade is this entry's reading of the evidence, not medical advice.