herb · for irregular digestion
Berberine
Shifts your gut bacteria toward the helpful ones and calms inflammation in the bowel.
Say that in clinical terms
Berberine modulates gut microbiome composition by suppressing pathogenic bacteria while supporting beneficial species. It regulates intestinal smooth muscle contraction, enhances bile acid metabolism, and reduces gut inflammation.
How strong is the research?
Solid evidence
Only one studyDifferent group studiedA different form was studied
1 paper read, 1 supporting.
Who was studied: A review spanning IBS, metabolic disease and animal studies.
How much to take
daily (split with meals)
500–1500 mg
Take 500mg with each main meal. Supports gut microbiome balance and motility.
Before you take it
- No NIH ODS Tolerable Upper Intake Level (UL) has been established for berberine; clinical trial data supports doses up to approximately 1.5 g/day for up to 6 months, but long-term safety data beyond 6 months is not well characterized.
- Potent quasi-irreversible inhibitor of CYP2D6 (approximately 9-fold suppression) and inhibitor of CYP3A4 and CYP2C9; raises clinically significant drug interaction risk with a large portion of prescription medications whose metabolism depends on these pathways.
- Contraindicated in pregnancy (crosses the placenta; associated with neonatal jaundice and kernicterus risk in newborns) and during breastfeeding.
- Additive hypoglycemia risk when co-administered with antidiabetic agents including metformin, insulin, and sulfonylureas.
- Commonly reported gastrointestinal adverse effects in clinical trial participants include nausea, constipation, abdominal discomfort, and diarrhea.
- Antibiotic-like modulation of gut microbiota composition, including potential suppression of beneficial species; long-term microbiome consequences in humans are not established.
- Berberine produces bidirectional effects on bowel function — constipation in some users and diarrhea in others in the same clinical trials — meaning individual response for 'irregular digestion' is unpredictable and the supplement may worsen the symptom it is intended to address.
When to take it
Best taken: with food