Methane / IMO — Self-Directed Action Plan

Built for the actual constraint: no breath test, no gastroenterologist. What to buy, in what order, and what to skip. Updated 7 August 2026.

Start here — the one idea that decides everything below

The strongest evidence available to you is not aimed at methane at all. It is aimed at constipation.

That is not a consolation prize. Methane slows transit, slow transit sustains the overgrowth, and the loop runs both ways — so treating the constipation properly is treating the methane, and it is the only part of this plan with guideline-strength backing behind it.

The herbal phase is the weakest link here, not the centrepiece. Sequencing matters more than shopping.

Evidence key used throughout: Guideline / RCT Controlled but limited Convention, very low evidence

This is the action layer. The diagnosis and full evidence appraisal live in the companion Word guide.

Phase 0 — Fix the constipation

Guideline strength Weeks 1–3 · start today

Do not skip to the herbs. If this phase alone clears your morning bloat, you are done — and you have spent about US$25.

Buy	Dose	Evidence	Cost
PEG 3350 — MiraLAX	17 g in 8 oz water, once daily	Strong recommendation, moderate certainty (AGA-ACG 2023). The only OTC laxative to earn a strong recommendation for chronic use	~US$25
Psyllium — you already have it	Your usual amount, ample water	Conditional recommendation, same guideline	—

Check Barbados pharmacies for the PEG first. It is a bulky powder and freighting it is wasteful if Collins, Knights or Massy stock it. PEG 3350 is a common OTC item.

Free, and genuinely load-bearing

4–5 hours between meals. No snacking. The migrating motor complex — the wave that sweeps the small intestine clean — only runs when you are not eating. Grazing never lets it start. This is the highest-value unpaid change available to you.
12-hour overnight fast. Your symptoms are worst in the morning because that is the end of the longest window in which nothing moved.
Keep avoiding your confirmed triggers: resistant starch, inulin/FOS, onion.

Target: a complete daily evacuation, Bristol type 4. Give it a full 3 weeks before judging.

Phase 1 — Add if Phase 0 is only partial

Controlled but limited Week 3 onward

Buy	Dose	Evidence	Cost
Magnesium oxide 400–500 mg	At bedtime	Conditional recommendation, AGA-ACG 2023; Mori 2019 RCT	~US$10
S. boulardii CNCM I-745 — Florastor	500 mg twice daily = 2 capsules twice daily (see dose note)	Maev 2025 RCT — see below	~US$30/50 caps

On the magnesium: the glycinate you already take is the non-laxative form. It is doing nothing for your constipation. Oxide and citrate are the laxative forms. Resolved in the merged daily schedule: glycinate stays at dinner (sleep/TTFD/vitamin-D roles), the oxide rides your existing ~2-hrs-after-dinner slot — no new window. If stools over-loosen, cut the oxide first, never the glycinate.

Why Florastor specifically — the most interesting item on this list

Maev et al. 2025 randomised 108 patients with SIBO associated with long-term PPI use — your exact stated history — to rifaximin alone, or rifaximin plus S. boulardii CNCM I-745 taken concurrently. SIBO persisted in 41.5% on rifaximin alone versus 21.8% with the combination (p=0.038), with better symptom resolution too.

Two things follow:

A probiotic taken during the kill phase improved eradication. It did not interfere. That is the direct answer to your question, from a controlled trial.
It works because it is a yeast. Antibacterial agents — rifaximin, and equally berberine or allicin — have no target on it. That is why this, and not a Lactobacillus blend, is the one to run through the herbal phase.

CNCM I-745 is the strain used in that trial, and Florastor is the only brand carrying it. Generic "S. boulardii" is a different strain.

Dose note — read before buying. The trial used 500 mg twice daily for 7 days, given simultaneously with the antibiotic. Florastor capsules are 250 mg, so the trial dose is 2 capsules twice daily — 4 a day. A 50-capsule bottle lasts about 12 days at that rate, so buy the 100-count if you intend to run it through Phase 2.

Practical reading: run the trial dose (2 caps twice daily) during the active antimicrobial weeks, then drop to the label dose (1 cap twice daily) if you continue afterwards. Continuing beyond 7 days is an extension past what the trial tested — reasonable and low-risk, but my inference, not their result.

Caveats worth holding, so you don't overweight this one study: it is a single trial, published in a Russian journal, in an antibiotic context rather than a herbal one, and patients were not stratified by gas type — so it is not specifically a methane result. It is still the best controlled evidence that exists on your exact question.

Phase 2 — One bounded herbal round

Very low evidence 4 weeks · only if 0+1 leave you symptomatic

Be honest with yourself about this phase. No controlled human trial shows any of these eradicates IMO. The study everyone quotes (Chedid 2014) was open-label, patient-choice, not methane-specific, and its result was not statistically significant (P=.24). This is a bounded, single, monitored experiment — not a treatment with a track record.

Buy	Dose	Notes
Stabilized allicin — Allimax 180 mg or Allimax Pro 450 mg	2–3×/day with food	The conventional methane-directed herb. Check excipients — some contain acacia gum or maltodextrin
Berberine HCl 500 mg (plain, no proprietary blend)	500 mg 2–3×/day with food	See the warning below

Berberine can cause constipation — which is your exact phenotype. This is a real risk, not a footnote. If your stools harden or evacuation gets worse in the first two weeks, drop the berberine and continue allicin alone. Do not push through it.

Rules for this phase

One stack. No rotating herbs, no third agent, no biofilm extras. If you change three things you learn nothing.
Keep the Florastor running through it. It is a yeast; the herbs cannot kill it.
Keep Phase 0 running underneath. The laxative does not stop.
Expect a possible flare in the first 3–7 days. Do not explain a severe or escalating reaction as "die-off" — that is how people talk themselves past a real problem.

Do not buy these — specific to you, with reasons

Skip	Why, for you specifically
Atrantil, Iberogast, any peppermint product	Peppermint relaxes the lower oesophageal sphincter. You have a reflux history. This is why Atrantil is not first-line here despite being the most-marketed methane product
Candibactin-AR, oregano/thyme oil capsules	Concentrated oils cause GI irritation and heartburn. Your earlier reflux plan already retired Candibactin-AR
Oral neem oil	Documented severe metabolic, neurologic and hepatic toxicity. Not a grey area
Dysbiocide	Wormwood plus a constipation caution — wrong direction for your phenotype
Biofilm disruptors, charcoal binders	The pilot was 13 people and neither arm eradicated IMO. Binders also block absorption of everything else you are taking
Align / B. infantis (longum) 35624	Kumar 2018: two weeks of it significantly raised breath methane (p=0.012). Wrong strain for your type
Inulin, FOS, chicory, resistant starch, PHGG	Your confirmed trigger class. PHGG has one pro-eradication trial but only alongside rifaximin — not worth it against your sensitivity

⛔ While you're ON the protocol — do not take these alongside it:

Align, or any probiotic listing B. infantis/longum 35624 — raised breath methane in testing. Wrong strain for your type, at any phase.
Plain Lactobacillus/Bifidobacterium probiotics in the same swallow as the herbs — berberine/allicin kill them. Wasted, not dangerous: space 2+ hours, or hold them until Phase 3.
Fermentable-fiber add-ins — inulin, FOS/chicory, resistant starch, PHGG/Sunfiber, 2'-FL HMO. Feeding the thing you're treating, and your trigger class.
Peppermint products (Atrantil, Iberogast) and concentrated oregano/thyme oils — your reflux. Applies the whole way through, not just Phase 2.
Charcoal or any "binder" — blocks absorption of everything else on the schedule.
Extra magnesium beyond the sheet — no citrate or extra oxide on top; the oxide + glycinate pairing already sits at the ceiling.
Berberine + hardening stools = stop the berberine (keep allicin).
Surgery/dental within a week → pause omega-3, curcumin and allicin first.
Breath test ever booked → all probiotics off, per that lab's washout sheet.
Famotidine and alginates are fine — just keep MgO and psyllium ~2 hours away from famotidine when easy.

Switch-over: what to stop buying from today

The simple list for moving your shopping onto the protocol.

🛑 Stop buying now — never restock:

Your current probiotic — don't rebuy when the bottle runs out; Florastor covers the protocol, Gastrus covers after. If its label lists B. infantis/longum 35624, stop taking it now, not just buying it.
2'-FL HMO — its purpose left with the old probiotic lineup, and it feeds your trigger class.
PHGG / Sunfiber — trigger class.
Calcium citrate — already dropped from the live plan.
Stay stopped (from June — don't drift back): molybdenum, digestive enzymes, Mitopure, and the old probiotic lineup (Bifido HN-019, 35624, B. coagulans IS-2, Akkermansia, the old S. boulardii).

🚫 Never start, however tempting: Atrantil / Iberogast / any peppermint, Candibactin-AR / oregano-thyme oils, Dysbiocide, oral neem, biofilm disruptors, charcoal binders — and MotilPro (your Motility Activator already is one).

✅ Keep buying as normal: everything on the baseline sheet — nothing is removed, magnesium glycinate included.

🛒 START buying — the switch-over shopping list (on the phase clock, not all at once):

When	Item	Where	~Cost
Today	MiraLAX (PEG 3350)	Collins/Knights/Massy first · Amazon fallback	~US$25
Today	Psyllium	already own — no purchase	—
Week 3, only if needed	Magnesium oxide 400–500 mg	local pharmacies · Amazon	~US$10
Week 3, only if needed	Florastor 100-count (CNCM I-745 — Florastor-only strain)	Amazon	50-ct ≈ US$30; trial dose burns 4/day → 100-ct
Only if Phase 2 triggers	Allimax stabilized allicin	180 mg / Pro 450 mg	—
Only if Phase 2 triggers	Berberine HCl 500 mg, plain single-ingredient	Amazon	—
Only after the herbal round	BioGaia Gastrus (L. reuteri DSM 17938)	Amazon	—

Nothing else. The prokinetic is already owned (Motility Activator) and every baseline item continues from its usual source.

Phase 3 — Hold the win

Weak, but the relapse data argues for it Weeks 6–12

Relapse after successful treatment is 43.7% at 9 months (Lauritano 2008), and slow motility is the likeliest root cause in your picture.

Buy	Dose
Prokinetic — already owned: your Motility Activator (ginger + artichoke) IS this item. Do not buy MotilPro.	Unchanged: 1–2 caps, empty stomach ~2 h after dinner, upright 15 min
BioGaia Gastrus — L. reuteri DSM 17938	Label dose

Reintroduce probiotics one per week, never several at once. Florastor is already running. L. reuteri DSM 17938 is the only strain with a methane-lowering signal (Ojetti 2017: 20.8 → 8.9 ppm, small and uncontrolled). Never reintroduce 35624.

Keep the meal spacing permanently. It costs nothing and it is the mechanism.

The circuit breaker

One clean round. If Phase 2 finishes with no clear improvement, stop — do not start round two. Cycling herbs indefinitely is the most common way people spend a year and several hundred dollars on a condition they never confirmed they had.

At that point the answer is information, not more product:

LiveWell Clinics TeleMed, BBD$50 online consult — your verified local pathway. It can order the cheap rule-outs that matter more than gas type: thyroid, celiac, iron, B12. Years of PPI use is itself a reason to check B12 and iron.
FoodMarble AIRE 2, US$269 — measures H₂ and CH₄, reusable, nothing to mail back, so Skybox handles it. It is a tracker, not a diagnostic. Useful for an objective number; it cannot diagnose IMO.
Trio-Smart, ~US$349 — the only 3-gas test, orderable without a doctor, but the mail-back bags within stability limits are the weak link from Barbados.

If you ever book a test: all probiotics off first, per that lab's own washout sheet. Probiotics inflate measured breath gas and will distort the result. This is the one scenario where stopping them genuinely matters.

Track it — 30 seconds a day

Without a breath test this is your only outcome measure, and it is better than memory.

Day	Morning bloat 0–10	Bristol 1–7	Complete evacuation?	Gas smell 0–10	Phase / changes

Change one thing at a time. A trend over 2–3 weeks is signal; a single bad day is not.

Red flags — stop and see a doctor

Severe or worsening abdominal pain, or progressive swelling with vomiting
Inability to pass stool or gas
Blood in stool, black or tarry stool
Fever, fainting or dehydration, jaundice
Unexplained weight loss, or new anaemia symptoms
Persistent straining or needing manual assistance → pelvic-floor assessment, not another antimicrobial round

Incomplete evacuation with no relief from passing gas is worth a pelvic-floor question in its own right. It is a common and treatable cause that no amount of herbs will touch.

Sources for the claims that changed this plan

Maev IV et al. Rifaximin + S. boulardii CNCM I-745 in PPI-associated SIBO. Ter Arkh 2025. n=108; persistence 21.8% vs 41.5%, p=0.038.
Chang L et al. AGA-ACG Guideline: Pharmacological Management of Chronic Idiopathic Constipation. 2023. PEG strong recommendation; magnesium oxide conditional.
Kumar K et al. B. infantis 35624 and the lactulose breath test. Dig Dis Sci 2018. Methane rose, p=0.012.
Ojetti V et al. L. reuteri DSM 17938 and methane. 2017.
Lauritano EC et al. SIBO recurrence after antibiotic therapy. Am J Gastroenterol 2008. 43.7% at 9 months.
Chedid V et al. Herbal therapy vs rifaximin. Glob Adv Health Med 2014. P=.24, not significant.
Mori S et al. Magnesium oxide RCT in chronic constipation. 2019.