SIBO Support: A Practitioner's Complete Gut Health Guide

SIBO — Small Intestinal Bacterial Overgrowth — is one of the most common underlying contributors to chronic digestive symptoms, yet it remains significantly under-recognized in conventional healthcare. If you have been dealing with persistent bloating, unpredictable bowel habits, chronic abdominal discomfort, or unexplained nutrient deficiencies, and have not found clear answers through standard testing, SIBO support is worth discussing with a knowledgeable healthcare provider.*

This guide brings together everything you need to understand about SIBO from a nutritional and supplement perspective — what it is, what the published research says about predisposing factors, how the Priority One four-stage SIBO supplement protocol is designed to support a healthy gut environment, what to eat, and how to approach long-term gut health maintenance.* It draws together information covered across our SIBO educational blog series into a single comprehensive reference.*

This article is for educational purposes only and does not constitute medical advice. Always work with a licensed healthcare practitioner for assessment, testing, and protocol guidance. The Priority One SIBO Protocol is designed for supervised use.*

What is SIBO?

SIBO is characterized by an abnormal increase in microbial populations in the small intestine — the section of the gastrointestinal tract where the vast majority of nutrient digestion and absorption occurs. In a healthy gut, the small intestine contains relatively few microorganisms compared to the large intestine — a ratio maintained by gastric acid, bile acids, digestive enzymes, intestinal immune function, and the Migrating Motor Complex (MMC).*

When microbial populations become imbalanced in the small intestine, these organisms ferment food — particularly carbohydrates — in the wrong location. This fermentation produces excess gas (hydrogen, methane, and hydrogen sulphide) and generates metabolic byproducts that contribute to the characteristic symptoms of SIBO:*

• Bloating and abdominal distension — often worse after eating fermentable carbohydrates*
• Excessive gas and flatulence*
• Abdominal discomfort and cramping*
• Altered bowel habits — loose stools or constipation depending on gas type*
• Nutrient malabsorption — particularly fat-soluble vitamins (A, D, E, K), B12, and iron*
• Food intolerances that develop over time — particularly to fermentable carbohydrates (FODMAPs)*
• Fatigue — often related to nutrient malabsorption and the metabolic burden of microbial imbalance*

For a detailed comparison of hydrogen-dominant and methane-dominant SIBO profiles, see our Methane vs. Hydrogen SIBO guide.

What predisposes the gut to SIBO?

SIBO rarely occurs in isolation — it is typically a consequence of one or more underlying factors that impair the normal physiological defenses that keep the small intestine's microbial population in check. The most commonly identified predisposing factors in published research include:*

Impaired Migrating Motor Complex function

The MMC is the gut's primary defense mechanism against small intestinal microbial accumulation — generating an organized wave of muscular contractions every 90–120 minutes during fasting that sweeps bacteria distally from the small intestine. MMC impairment is considered by many SIBO-specialized practitioners to be the single most important predisposing factor, and can result from:*

• Enteric nervous system damage from prior gut infections (particularly food poisoning caused by Campylobacter and other organisms)*
• Frequent snacking habits that prevent the fasting-period MMC activation*
• Chronic psychological stress via HPA axis effects on gut motility*
• Hypothyroidism — thyroid hormone plays a documented role in normal gut motility*
• Certain medications including opioids and proton pump inhibitors*

Reduced gastric acid production

Normal gastric acid provides a crucial sterilization barrier — killing the majority of bacteria ingested with food before they reach the small intestine. Hypochlorhydria (low gastric acid) significantly increases the microbial load entering the small intestine with each meal. Long-term proton pump inhibitor (PPI) use is among the most commonly identified medication-related contributors to SIBO in published research.*

Structural abnormalities

Post-surgical adhesions, strictures, diverticula, and anatomical changes from prior intestinal surgery can impair normal intestinal transit — creating areas of stasis where microorganisms accumulate.* Ileocecal valve dysfunction — allowing retrograde flow from the large intestine into the small intestine — is also a recognized structural contributor.*

Immune function

Secretory IgA in the intestinal mucosa plays an important role in maintaining normal gut microbial ecology.* Conditions associated with impaired mucosal immune function have been associated with increased SIBO incidence in published research.*

How SIBO is assessed

Breath testing — specifically lactulose or glucose breath tests measuring hydrogen and methane gas — is the standard non-invasive assessment tool used by naturopathic physicians and functional medicine practitioners. Following ingestion of a fermentable substrate, elevated gas readings at early time points indicate abnormal fermentation in the small intestine.*

Jejunal aspirate culture is the gold standard diagnostic approach but is invasive and rarely used in clinical practice. Most practitioners rely on breath testing combined with clinical history and symptom patterns for assessment.*

Always consult a licensed healthcare practitioner for proper assessment before beginning any gut health supplement protocol.

The Priority One four-stage SIBO support protocol

The Priority One SIBO Protocol was developed by Dr. Mona Morstein ND — one of North America's most recognized naturopathic physicians specializing in gastrointestinal health, metabolic wellness, and integrative medicine, and the author of Master Your Diabetes. The protocol addresses the four essential dimensions of SIBO gut health support — microbial balance, motility restoration, intestinal repair, and ongoing digestive enzyme support — in a structured, staged sequence.*

Stage 1 — Botanical Gut Microbial Balance Support: SIBOtic™

SIBOtic™ | Garlic 1% Allicin, Berberine HCl 97%, Caprylic Acid & Oregano Oil for SIBO Antimicrobial Support by Dr. Morstein | 180 Vegetarian Capsules

$87.50

SIBOtic™ — Four-Compound Botanical Antimicrobial Complex for SIBO Treatment Support by Dr. Morstein SIBOtic™ is the antimicrobial treatment component of Dr. Mona Morstein ND's SIBO protocol — a high-dose, four-compound botanical antimicrobial formula providing broad-spectrum activity against the bacteria and/or… read more

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SIBOtic™ is a four-compound botanical formula providing broad-spectrum gut microbial balance support through four distinct and complementary mechanisms.* Each ingredient has been selected for its documented in vitro activity against the microbial species associated with both hydrogen-dominant and methane-dominant profiles, and for its mechanistic distinctiveness — ensuring multi-mechanism botanical coverage:*

• Garlic Bulb Extract 1% Allicin (1,500mg): Allicin provides thiol enzyme alkylation activity — the most allicin-concentrated dose in any comparable formula, with published in vitro activity against both hydrogen-producing bacteria and methane-producing archaea (Methanobrevibacter smithii).*
• Berberine HCl 97% from Coptis chinensis (500mg): DNA intercalation and FtsZ cell division inhibition — one of the most extensively published botanical gut health compounds, providing 485mg of pure berberine per serving at 97% purity.*
• Caprylic Acid (300mg): Membrane phospholipid disruption — particularly relevant for Candida co-colonisation, a common finding alongside gut microbial imbalance.*
• Oregano Leaf Oil (300mg): Carvacrol and thymol membrane potential disruption — broad-spectrum in vitro activity, synergistic with caprylic acid's membrane-level action.*

For a full breakdown of each ingredient see our Oregano Oil guide and Berberine HCl guide.*

Stage 2 — Intestinal Motility Support: SIBO-MMC™

SIBO-MMC™ | P-5-P Active B6, 5-HTP 98%, Ginger 5% Gingerols & Jujube for MMC Motility & SIBO Support by Dr. Morstein | 180 Vegetarian Capsules

$66.00

SIBO-MMC™ — Migrating Motor Complex Motility & Serotonin Pathway Support for SIBO Management by Dr. Morstein SIBO-MMC™ is a clinically targeted gastrointestinal motility formula developed exclusively by Dr. Mona Morstein ND — one of North America's leading naturopathic physicians specialising… read more

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SIBO-MMC™ supports normal MMC function through the serotonergic MMC activation pathway — the primary biochemical mechanism through which normal MMC cycling is initiated. This is the most mechanistically targeted MMC support formula available, addressing the root neurological cause of SIBO recurrence:*

• 5-HTP 98% from Griffonia simplicifolia (75mg): The direct serotonin precursor. Approximately 95% of the body's serotonin is produced by enterochromaffin cells in the intestinal mucosa — this intestinal serotonin drives normal MMC activation via 5-HT4 receptors.*
• P-5-P Active B6 (15mg, 882% DV): The essential cofactor for AADC — the enzyme that converts 5-HTP to serotonin in intestinal mucosa cells. Active form ensures maximal conversion.*
• Ginger 5% Gingerols (200mg): Supports normal gastric emptying via motilin receptor activity and normal antroduodenal motility via 5-HT4 agonism — a well-studied prokinetic botanical.*
• Jujube 2% Jujuboside (200mg): Supports normal autonomic nervous system balance — the parasympathetic nervous system is the primary driver of normal MMC initiation.*

Important warning: SIBO-MMC™ contains 5-HTP. If you are taking antidepressants — particularly MAOIs or SSRIs — consult your healthcare provider before use.*

Stage 3 — Intestinal Repair & ENS Support: SIBO-Rebuild™

SIBO-Rebuild™ | L-Glutamine, Acetyl L-Carnitine, Lion's Mane & Zinc for Intestinal Repair & ENS Support by Dr. Morstein | 180 Vegetarian Capsules

$71.50

SIBO-Rebuild™ — Intestinal Mucosal Repair, Enteric Nervous System Support & Post-SIBO Gut Rebuilding by Dr. Morstein SIBO-Rebuild™ is the intestinal repair and rebuilding formula in Dr. Mona Morstein ND's SIBO protocol — designed to address the mucosal damage, enteric nervous… read more

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SIBO-Rebuild™ addresses the intestinal mucosal damage and enteric nervous system compromise that makes gut microbial imbalance recur — supporting normal intestinal barrier integrity and ENS health from four complementary directions:*

• L-Glutamine (750mg): Primary metabolic fuel for enterocytes — supports normal tight junction protein synthesis, normal mucin production, and normal intestinal mucosal integrity.*
• Lion's Mane Hericium erinaceus (250mg): The only functional mushroom with documented nerve growth factor (NGF) stimulating activity via hericenones and erinacines — supporting normal ENS neuron maintenance and healthy gut-brain axis function.*
• Acetyl L-Carnitine HCl (750mg): Supports normal ENS mitochondrial function, normal acetylcholine synthesis, and normal neuronal energy metabolism — working synergistically with Lion's Mane for comprehensive ENS support.*
• Zinc Orotate (10mg, 91% DV): Essential cofactor for normal tight junction protein synthesis and metalloproteinase-mediated mucosal repair.*

All Stages — Digestive Enzyme & Bile Acid Support: SIBOZyme™

SIBOZyme™ | Pancreatin 10X, Ox Bile 300mg, Tolerase-G®, Lactase, Betaine HCl & Full Digestive Enzyme Complex for SIBO by Dr. Morstein | 180 Capsules

$110.00

SIBOZyme™ — Comprehensive Digestive Enzyme & Bile Acid Support for SIBO Management by Dr. Morstein SIBOZyme™ is the digestive enzyme support component of Dr. Mona Morstein ND's SIBO protocol — a comprehensive digestive enzyme and bile acid formula specifically formulated… read more

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SIBOZyme™ is taken with every meal throughout all three stages of the protocol — addressing the impaired digestion that characterises gut microbial imbalance from the very first day of the protocol:*

• Betaine HCl 98% (220mg): Supports normal gastric acid levels for food sterilisation and optimal enzyme activation*
• Pancreatin 8X (400mg): Amylase 80,000 USP, Lipase 13,200 USP, Protease 80,000 USP — high-potency macronutrient enzyme replacement*
• Ox Bile (300mg): Replaces bile acid emulsification function impaired by bacterial deconjugation in gut microbial imbalance*
• Tolerase-G® Prolyl Endopeptidase (25mg): DSM-registered enzyme for normal gluten peptide digestion*
• Lactase, Maltase, Sucrase (100mg each): Comprehensive brush border enzyme replacement for the enzyme deficiencies caused by small intestinal inflammation*

Also available as SIBOZyme™ (No HCL) for individuals with normal or elevated gastric acid.*

SIBOZyme™ (No HCL) | Pancreatin 10X, Ox Bile 45% Cholic Acid, Tolerase-G™, Lactase & Full Digestive Enzyme Complex for SIBO by Dr. Morstein | 180 Capsules

$110.00

SIBOZyme™ (No HCL) — Comprehensive Digestive Enzyme & Bile Acid Support Without Betaine HCl, for SIBO Management by Dr. Morstein SIBOZyme™ (No HCL) is the Betaine HCl-free version of Dr. Mona Morstein ND's SIBOZyme digestive enzyme formula — designed for… read more

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The SIBO Support Bundle — all four core products together

The SIBO Support Bundle — brings all four core protocol products together in a single purchase: SIBOtic™ , SIBO-MMC™ , SIBO-Rebuild™ , and SIBOZyme™  — a combined retail value of $341.00.* Available in our SIBO Protocol collection alongside the additional support products below.*

Additional SIBO protocol support products

For a full breakdown of these additional products and how they fit the protocol, see our Botanical Support guide and Probiotics & SIBO guide.*

Dietary support for SIBO gut health

The dietary foundation that best complements the Priority One SIBO Protocol is a low-FODMAP, low-fermentation eating pattern — minimizing fermentable carbohydrate intake to reduce the substrate available for fermentation in the small intestine during the active Stage 1 support phase, and gradually expanding dietary variety through Stages 2 and 3 under practitioner guidance.*

The most important dietary practice of all — more impactful than any specific food choice — is meal spacing: eating 3 structured meals per day with 4–5 hour gaps between them and no snacking. This fasting interval is the window during which the MMC activates and performs its intestinal sweeping function. Without it, SIBO-MMC™ cannot support the MMC effectively.*

For a comprehensive dietary guide including a 7-day low-FODMAP meal plan, see our SIBO Diet Guide.*

Lifestyle factors that support gut health

Beyond diet and supplements, several evidence-informed lifestyle practices support normal gut motility and a healthy gut environment:*

• Consistent meal timing — eating at regular times supports normal MMC cycling*
• No late-night eating — the overnight fast is one of the most active MMC periods; eating close to bedtime interrupts it*
• Stress support — chronic stress impairs MMC function via HPA axis effects on gut motility; practices supporting normal stress physiology benefit gut health*
• Adequate sleep — normal sleep supports overnight MMC activity and normal gut repair processes*
• Gentle movement — regular moderate physical activity supports normal intestinal transit*

Our complete SIBO educational resource library

We have published a growing library of in-depth educational guides covering all aspects of the Priority One SIBO Protocol and SIBO gut health support:*

• The SIBO Diet Guide: What to Eat, What to Avoid & a 7-Day Meal Plan
• Oregano Oil for SIBO: How It Works & What to Look For
• Methane SIBO vs. Hydrogen SIBO: Key Differences Explained
• Botanical Support for Gut Microbial Balance: The Evidence
• Should You Take Probiotics with SIBO? What the Research Shows
• Supporting SIBO Recovery: What to Expect on a Natural Protocol
• Berberine HCl: Mechanisms, Research & What to Look For

*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. This article is for educational purposes only and does not constitute medical advice. The Priority One SIBO Protocol is designed for use under the supervision of a licensed healthcare practitioner — individual responses vary significantly and these protocols are not one-size-fits-all. Always consult your physician, naturopathic doctor, or qualified healthcare provider before beginning any supplement protocol, making dietary changes, or discontinuing any medications. SIBOZyme™ contains Ox Bile — not suitable for vegetarians or vegans. SIBO-MMC™ contains 5-HTP — consult your healthcare provider before use if taking antidepressants. Para Clean™ contains Black Walnut (tree nut) and Sweet Wormwood — not for use during pregnancy. Tributyrin Advanced contains bovine-derived ImmunoLin® — not suitable for those with bovine protein allergies. Priority One Nutritional Supplements is an FDA 21 CFR Part 111 and NSF/ANSI 455-2 certified company.