SIBO occurs when bacteria—typically meant to live lower in the digestive tract—migrate or overgrow into the small intestine, where they ferment carbohydrates too early, triggering gas, inflammation, and nutrient malabsorption. It’s stealthy, stubborn, and increasingly common—especially among those with chronic stress, irregular eating patterns, or a history of antibiotics or acid blockers.

Why Functional Medicine Loves the 5‑R Model

1. Remove: Eliminate the overgrowth through targeted antimicrobials.
2. Replenish: Restore digestive enzymes and acids that may be impaired.
3. Repair: Heal the intestinal lining and support the gut barrier.
4. Re‑inoculate: Introduce beneficial microbes strategically.
5. Re‑balance: Optimize lifestyle, stress, and motility to prevent recurrence.

What Works: Tools That Deliver Results

1. Accurate Diagnosis: Breath Tests

2. Remove: Choose the Right Antimicrobials

Once diagnosed, the next step is targeted microbial reduction. Depending on the breath test results and symptom profile, we use:

• Rifaximin: A minimally absorbed antibiotic, highly effective for hydrogen-dominant SIBO. Its localized action spares the rest of your microbiome.
• Neomycin (often with rifaximin): For methane-dominant SIBO, commonly seen in those with constipation or sluggish motility.
• Herbal antimicrobials: When appropriate, we opt for botanical combinations like berberine, neem, oregano oil, allicin, and goldenseal—which can be just as effective and better tolerated long-term.
• Biofilm disruptors: Some patients harbor bacteria shielded in mucus-like coatings. Supplements like N-acetylcysteine or serrapeptase help break this layer for deeper microbial access.

We personalize duration, dosing, and combination based on clinical history, test outcomes, and prior treatment responses.

3. Dietary Reset: Starve or Soothe

SIBO thrives on fermentable carbohydrates—especially FODMAPs (Fermentable Oligo-, Di-, Monosaccharides and Polyols). By reducing these in the short term, we deprive the overgrowth of its fuel.

• Low-FODMAP diet: A 4–6 week elimination approach followed by strategic reintroduction. It’s effective—but only if done with professional guidance to avoid long-term nutritional gaps.
• Elemental diet: A medically formulated meal-replacement plan, consisting of pre-digested nutrients (amino acids, glucose, fats). It’s highly effective in stubborn or recurrent cases—delivering up to 80–85% clearance within 2–3 weeks.
• Customized plans: At One’s, we may also tailor diets with low histamine, SCD (Specific Carbohydrate Diet), or bi-phasic SIBO plans depending on symptoms, co-conditions, and tolerance.

Importantly, these diets are never forever. Reintroduction is key for microbial diversity, long-term gut resilience, and mental well-being.

4. Replenish: Enzymes & Nutrients

Due to damage in the small intestinal lining and disrupted absorption, patients often present with:

• Vitamin B12, iron, and folate deficiencies → linked to fatigue, anemia, neuropathy
• Fat-soluble vitamin deficits (A, D, E, K) → affecting vision, immunity, bone density
• Zinc and magnesium depletion → impacting skin, sleep, cognition, and hormone balance

5. Re‑inoculate & Re‑balance

We don’t rush this. Not all probiotics are helpful in SIBO, especially in methane-dominant types. But evidence supports:

• Lactobacillus plantarum, L. rhamnosus, Bifidobacterium lactis—as strains shown to suppress pathogenic growth and modulate inflammation
• Spore-based probiotics (like Bacillus subtilis): For gut barrier reinforcement without contributing to fermentation
• Selective prebiotics like partially hydrolyzed guar gum—reintroduced slowly to avoid triggering relapse

We use:

• Prokinetics like ginger, low-dose erythromycin, or prucalopride
• Lifestyle adjustments: Time-restricted eating, consistent meal spacing, vagus nerve activation

When First-Line Fails: Managing Recurrence

• Is it poor motility?
• Post-surgical anatomy (e.g., appendectomy, C-section)?
• Stress and cortisol imbalance suppressing digestion?
• Low stomach acid from chronic PPI use?

Each case gets a root-cause map. For patients with more than two relapses per year, we explore maintenance antimicrobials, rotational herbal protocols, and deeper work on gut-brain axis, trauma history, or stealth infections.

Bringing It Together: One’s Clinic Case

A 42-year-old marketing executive came to our Apgujeong clinic after years of inconsistent bowel movements, stubborn belly bloat, and brain fog that worsened in the afternoons. She’d tried multiple elimination diets with only partial relief.

By week three, her bloating subsided. By week five, her energy was steady, and she could focus in meetings again. A follow-up breath test normalized by week seven. With the help of probiotics and motility support, she reintroduced a wider diet without symptoms—and no relapse a year later.

This is what true healing looks like—not masking, but resetting.

Subtle Symptoms You Might Miss

SIBO isn’t just about gut noise. In our clinic, we often see:

• Chronic fatigue not explained by labs
• Rosacea or unexplained skin flares
• Iron or B-vitamin deficiencies despite healthy diet
• Mood dips and post-meal fog

If you’ve been told “it’s just IBS” or you feel dismissed by generic advice—it’s time to look deeper.

Should You Try This at Home?

We get it—many patients come to us after reading online forums or starting elimination diets on their own. But be cautious:

• Breath testing matters. Don’t assume based on symptoms alone.

• Self-medicating with antimicrobials or probiotics can backfire—especially without clear understanding of your gas type.

• Functional medicine isn’t “just supplements”—it’s a system of precision diagnostics, clinical insight, and sustainable rebalancing.

Why It Matters—Especially in Seoul

Treating SIBO properly improves more than digestion:

• It resets metabolism, supports immunity, and lifts brain fog.

• It prevents deeper downstream issues like thyroid dysfunction, estrogen dominance, or autoimmune activation.

• It reconnects you with your body’s signals—and restores joy in eating again.

In Summary: What Fixes SIBO That Actually Works

Ready to Reset?

If you’ve done everything “right” but still feel off—it may be time to stop treating symptoms and start treating systems.