SIBO / IBS Support protocol

SIBO / IBS Support

digestionmoderate evidence

About this protocol

Small intestinal bacterial overgrowth (SIBO) and irritable bowel syndrome (IBS) overlap significantly — up to 60% of IBS patients test positive for SIBO via lactulose or glucose breath testing. The conventional treatment is rifaximin (a non-absorbed antibiotic) ± neomycin for methane-dominant cases. Herbal antimicrobials have surprisingly competitive trial evidence — a 2014 trial found herbal protocols comparable to rifaximin for SIBO eradication. This stack pairs antimicrobial botanicals (berberine, oregano oil) with gut-barrier and motility support (L-glutamine, peppermint oil, prokinetic herbs). If you suspect SIBO, get a breath test first — empirically treating without testing leads to wasted protocols and prolonged symptoms. If your IBS is moderate-to-severe, see a gastroenterologist; treatment-resistant cases benefit from proper workup (celiac panel, calprotectin, sometimes endoscopy).

Where to start

Start with breath testing. A lactulose or glucose breath test identifies SIBO type (hydrogen-dominant, methane-dominant, hydrogen sulfide). Methane-dominant requires different treatment than hydrogen-dominant.

Antimicrobial phase (4-6 weeks): Berberine + oregano oil, taken with each meal. Trial evidence shows comparable eradication rates to rifaximin.

Gut barrier support during AND after: L-glutamine for intestinal lining repair. 5 g twice daily on empty stomach.

Symptomatic support: Enteric-coated peppermint oil before meals for acute bloating and pain.

Prokinetic phase (after antimicrobial): Atrantil or ginger for the 3 months after antimicrobial treatment. SIBO recurrence is common — the migrating motor complex (MMC) often needs prokinetic support to prevent re-overgrowth.

This is a structured protocol, not chronic supplementation. Use the antimicrobials for 4-6 weeks, then taper. Re-test breath after if symptoms persist.

5 nutrients

Start here

Strongest evidence — the foundation of the stack.

Berberine

500 mg with each meal (1500 mg total daily) for 4-6 weeks
morningwith food

Berberine is a plant alkaloid with broad-spectrum antimicrobial activity against gut bacteria. A 2014 trial at Johns Hopkins found herbal protocols (including berberine) comparable to rifaximin for SIBO eradication. Mechanism is direct antibacterial plus modest gut-barrier support. Use for a structured 4-6 week course, not chronic.[1, 2, 3]

5 documented interactions →

Oregano Oil (Carvacrol-Standardized)

100-200 mg standardized (50-70% carvacrol) with each meal for 4-6 weeks
morningwith food

Oregano oil''s active compound carvacrol has broad-spectrum antimicrobial activity against bacteria and Candida. Studies in vitro and in human SIBO trials support efficacy. Always use enteric-coated or take with food — high-dose unprotected oregano oil is harsh on the esophagus and stomach.[4, 5, 6]

Add if needed

Add these only if the foundation isn't enough.

L-Glutamine

5 g twice daily on empty stomach, during and after antimicrobial phase
morningempty stomach

L-glutamine is the primary fuel source for enterocytes. Trial evidence in post-infectious IBS shows reduced symptoms and improved barrier function. Particularly relevant after antimicrobial treatment when the gut lining needs repair.[7, 8, 9]

Peppermint Oil (Enteric-Coated)

180-225 mg, 30-60 min before meals for symptomatic relief
morningempty stomach

Enteric-coated peppermint oil relaxes intestinal smooth muscle and reduces bloating, pain, and gas in IBS. Multiple meta-analyses support efficacy comparable to some pharmaceuticals. Critical that the coating is enteric — non-coated peppermint oil is destroyed in the stomach and causes reflux.[10, 11, 12]

Experimental

Emerging evidence — try last, only if curious.

Prokinetic Support (Ginger or Atrantil)

Ginger 1-2 g daily OR Atrantil 2 capsules 3× daily
morningwith food

After antimicrobial treatment, SIBO recurrence is common because the underlying motility issue persists. Prokinetic agents support the migrating motor complex (MMC) — the gut''s housekeeping wave. Ginger has prokinetic evidence; Atrantil (quebracho, conker tree, peppermint blend) has small trials for methane-dominant SIBO. Use for the 3 months after antimicrobial treatment.[13, 14, 15]

Warnings

Do not take with: Rifaximin or other antibiotics (don't stack herbal antimicrobials with prescribed antibiotics — pick one approach). Diabetes medications (berberine + insulin = hypoglycemia risk). CYP3A4-metabolized drugs (berberine inhibits CYP3A4). Anticoagulants (oregano and ginger have mild anti-platelet effects). PPIs and H2 blockers — SIBO often results from chronic acid suppression; discuss with your prescriber whether weaning is appropriate.
Do not take if: You are pregnant or breastfeeding (berberine, oregano oil, and high-dose peppermint contraindicated). You have severe liver or kidney disease. You take warfarin or DOACs. You have an active inflammatory bowel disease flare (different treatment paradigm). You are immunocompromised (broad-spectrum antimicrobials can shift gut microbiome unpredictably). Suspected SIBO without breath test confirmation should warrant testing before empirical treatment.

Lifestyle improvements

Get tested before treating

A lactulose or glucose breath test confirms SIBO and identifies hydrogen vs. methane dominance. Empirically treating without testing often misses the right approach (methane-dominant SIBO responds poorly to standard rifaximin-only protocols).

Low-FODMAP diet during antimicrobial phase

Reducing fermentable carbs starves overgrowth bacteria while you''re treating them. Don''t stay on low-FODMAP long-term — it''s a tool for the antimicrobial phase, not a forever diet (long-term restriction can worsen gut diversity).

Address the underlying cause

SIBO is usually downstream of something else: motility disorders, post-infectious changes, chronic PPI use, food poisoning history, post-surgical changes, hypothyroidism. Without addressing the upstream cause, SIBO recurs.

Hydrate aggressively

Adequate water supports gut motility and dilutes bacterial metabolites.

Move daily

Sedentary lifestyle worsens gut motility. 30-minute walks improve transit time measurably.

Stress management

The gut-brain axis is real — chronic stress worsens IBS symptom severity. Address upstream stressors with therapy, exercise, sleep.

Test for and treat H. pylori

Coexistent H. pylori can drive SIBO-like symptoms via reduced stomach acid. Simple breath or stool test identifies it.

See a SIBO-aware practitioner

Many general GIs under-test for SIBO. Functional medicine, integrative GI, or specifically SIBO-trained practitioners often offer more structured approaches.

References

  1. Berberine — supplement research overviewExamine.com link
  2. Chedid V, et al. Herbal therapy is equivalent to rifaximin for the treatment of small intestinal bacterial overgrowth. Glob Adv Health Med. 2014;3(3):16-24.PubMed link
  3. Ghaffari T, et al. Berberine: A potential agent for the management of metabolic syndrome. Adv Pharm Bull. 2017;7(2):199-208.PubMed link
  4. Oregano — supplement research overviewExamine.com link
  5. Force M, et al. Inhibition of enteric parasites by emulsified oil of oregano in vivo. Phytother Res. 2000;14(3):213-214.PubMed link
  6. Ozdemir N, et al. Origanum onites L. essential oil components and antimicrobial activity. Plants. 2018;7(4):104.PubMed link
  7. L-Glutamine — supplement research overviewExamine.com link
  8. Zhou Q, et al. Randomised placebo-controlled trial of dietary glutamine supplements for postinfectious irritable bowel syndrome. Gut. 2019;68(6):996-1002.PubMed link
  9. Achamrah N, et al. Glutamine and the regulation of intestinal permeability. Curr Opin Clin Nutr Metab Care. 2017;20(1):86-91.PubMed link
  10. Peppermint — supplement research overviewExamine.com link
  11. Khanna R, et al. Peppermint oil for the treatment of irritable bowel syndrome: a systematic review and meta-analysis. J Clin Gastroenterol. 2014;48(6):505-512.PubMed link
  12. Alammar N, et al. The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis. BMC Complement Altern Med. 2019;19(1):21.PubMed link
  13. Ginger — supplement research overviewExamine.com link
  14. Brown K, et al. Response of irritable bowel syndrome with constipation patients administered a combined quebracho/conker tree/M. balsamea Willd extract. World J Gastrointest Pharmacol Ther. 2016;7(3):463-468.PubMed link
  15. Hu ML, et al. Effect of ginger on gastric motility. World J Gastroenterol. 2011;17(1):105-110.PubMed link

Related protocols

Other digestion protocols and protocols sharing ingredients with this one.

Bloating SOS

digestion

Bloating has many causes — gas-producing foods, lactose or fructose malabsorption, SIBO, IBS, slow gastric emptying, swallowed air, hormonal cycle effects. The supplement category for acute bloating is well-evidenced: ginger and peppermint oil accelerate gastric emptying and relax intestinal smooth muscle, digestive enzymes break down problematic dietary proteins/carbs, and fennel is the traditional carminative with real evidence. This stack is for acute bloating episodes; for chronic gut issues see SIBO/IBS Support or Daily Gut Foundation.

Daily Gut Foundation

digestion

The gut-supplement market is overrun with "leaky gut" cure-alls and proprietary blends. The actual evidence is narrower than the marketing suggests. What is well-supported: a diverse fiber intake feeds beneficial bacteria, specific probiotic strains reduce antibiotic-associated diarrhea and shorten gastroenteritis episodes, and L-glutamine has some evidence for intestinal barrier support. This protocol is the conservative foundation — start here before chasing specific gut conditions with more aggressive interventions.

Constipation Support

digestion

Chronic constipation affects up to 20% of adults and is one of the most over-treated yet poorly-resolved digestive complaints. Most cases are functional — insufficient fiber and water intake, low movement, poor stool-call timing, or medication side effects. The supplement category has genuine evidence: magnesium (osmotic laxative effect — well-evidenced and well-tolerated), psyllium (bulk-forming fiber, gold standard for chronic constipation), and specific probiotic strains (Bifidobacterium lactis HN019, B. longum) with motility-improving evidence. Stimulant laxatives (senna, bisacodyl) are explicitly NOT in this stack — they work acutely but cause tolerance and worsen long-term motility with chronic use. If you have new-onset constipation, blood in stool, weight loss, severe abdominal pain, or family history of colon cancer — see a GI doctor, not a supplement protocol. Those warrant proper workup.

Acid Reflux / Heartburn

digestion

Gastroesophageal reflux disease (GERD) affects 20% of adults and is one of the most over-medicated conditions — long-term proton pump inhibitor (PPI) use is associated with B12 deficiency, calcium malabsorption, increased C. difficile and pneumonia risk, and possible kidney effects. The supplement category for mild-to-moderate reflux has reasonable evidence: deglycyrrhizinated licorice (DGL) for mucosal protection, slippery elm for mucilage coating, and ginger for prokinetic effects. Betaine HCl is included WITH STRONG CAVEATS — it''s only appropriate for adults with low stomach acid causing reflux-like symptoms, NEVER for active GERD or ulcer disease. This protocol is for mild symptoms, intermittent heartburn, or as a PPI-weaning aid under medical supervision. Severe or persistent reflux warrants proper GI evaluation (endoscopy, Barrett''s screening) — not chronic self-supplementation.

Foundational Weight Support

weight· 1 shared ingredient

Weight loss is overwhelmingly downstream of energy balance, hormonal context, sleep, and stress — not supplementation. That said, a few compounds have legitimate trial evidence for supporting weight loss when combined with caloric restriction and exercise. None of these will produce meaningful loss on their own. The strongest evidence is for fiber (gastric distension and satiety), berberine (insulin sensitization and modest weight effects), and green tea catechins (small thermogenic effect). Magnesium and chromium correct common deficiencies that worsen insulin handling. This is the category anchor — the boring evidence-backed foundation before chasing trends. If you have more than 30 pounds to lose, a metabolic condition, or have failed multiple weight-loss attempts, please consider a doctor-supervised approach. GLP-1 medications (semaglutide, tirzepatide) have dramatically larger effect sizes than any supplement stack and are increasingly accessible. Supplements complement medical and lifestyle interventions — they do not replace them.

Blood Sugar / Insulin Resistance

metabolic· 1 shared ingredient

Insulin resistance is upstream of nearly every chronic disease that kills modern adults: type 2 diabetes, cardiovascular disease, fatty liver, cognitive decline, certain cancers. The good news is it''s one of the most reversible metabolic states — with lifestyle change being the strongest lever (Diabetes Prevention Program: 58% reduction in progression to diabetes vs. 31% for metformin). The supplement category has genuine evidence: berberine produces effects comparable to metformin for HbA1c and fasting glucose; chromium and alpha-lipoic acid improve insulin sensitivity; cinnamon (Ceylon variety) modestly reduces post-meal glucose spikes; magnesium corrects a commonly low cofactor in insulin signaling. This stack is for adults with elevated fasting glucose, elevated HbA1c, elevated fasting insulin, or known insulin resistance — including those with PCOS, prediabetes, or metabolic syndrome. It complements lifestyle change rather than substituting for it. If your HbA1c is over 6.5% or your fasting glucose is over 126 mg/dL, you have type 2 diabetes — that''s a medical condition that warrants proper management, not solo supplementation.

Track this protocol in Pilora

Add these supplements to your shelf, get smart dose reminders, and check for interactions — all in the Pilora iPhone app.

Coming to App Store

Disclaimer: These statements have not been evaluated by the FDA. This protocol is educational, not a substitute for personalized medical advice. Talk to your doctor before starting any new supplement regimen — especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition. Last updated 5/20/2026.