Goal hub·Gut Health·Reviewed June 9, 2026

Gut supplements with strain-level and trial-level evidence.

Gut health is where strain specificity matters most: a probiotic that works for antibiotic-associated diarrhea says nothing about IBS. This hub ranks fibers, probiotics, and gut-lining supplements by the trials behind each specific use, strain by strain.

Top supplements → Browse all goal hubs

Top supplements

Ranked by evidence, top first.

Sorted by evidence tier, strongest first. Each supplement’s rating is its own; open any name for the full profile with dosing, forms, and citations.

01
BerberineStrong
Plant alkaloid with remarkable metabolic effects, often compared to metformin. Potent for blood sugar management, cholesterol, and gut health.
02
Ginger ExtractStrong
Warming root studied for nausea, digestion, and inflammatory-marker contexts.
03
Lactobacillus RhamnosusStrong
One of the most researched probiotic strains for gut and immune health.
04
ProbioticsStrong
Live beneficial bacteria that colonize the gut microbiome. Support digestion, immune function, mental health (gut-brain axis), and nutrient synthesis.
05
Psyllium HuskStrong
Soluble fiber supplement for digestive regularity and cholesterol reduction.
06
Saccharomyces BoulardiiStrong
Beneficial probiotic yeast resistant to antibiotics, ideal for gut support during antibiotic use.
07
Peppermint Oil (Enteric-Coated)Strong
Enteric-coated peppermint oil is a menthol-rich Mentha piperita oil preparation used for IBS abdominal pain and bloating. Evidence from meta-analyses and guidelines supports short-term IBS symptom relief, especially when enteric coating li...
08
Beta-GlucanModerate
Beta-glucans are glucose polysaccharides from yeast, oats, barley, mushrooms, and fungi with different structures and effects. Yeast 1,3/1,6 beta-glucans have randomized-trial evidence for reduced severity or frequency of upper respiratory...

Protocols

Dose and timing, from the trials.

Dose ranges, forms, and timing as used in the underlying clinical trials. Population notes call out who each trial enrolled.

Probioticsfor General gut support

Dose

10-20 billion CFU daily

Form

Multi-strain Lactobacillus/Bifidobacterium blend

Timing

With food if the product suggests it

Notes

Strain quality matters more than chasing the highest CFU number.

Lactobacillus Rhamnosusfor Antibiotic-associated diarrhea prevention

Dose

10-20 billion CFU daily

Form

Lactobacillus rhamnosus GG

Timing

Take 2-3 hours away from the antibiotic

Notes

One of the best-studied strain-specific uses.

Saccharomyces Boulardiifor Antibiotic-associated diarrhea prevention

Dose

250-500 mg 1-2 times daily

Form

Saccharomyces boulardii CNCM I-745

Timing

Can be taken during antibiotic use

Notes

Yeast probiotic, so it is not inactivated by antibacterial antibiotics.

Saccharomyces Boulardiifor Travelers diarrhea support

Dose

250 mg twice daily

Form

Saccharomyces boulardii CNCM I-745

Timing

Start a few days before travel

Notes

Use only if you tolerate it well before travel.

Bifidobacterium infantis 35624for IBS Symptom Relief

Dose

1 billion CFU daily for 4-8 weeks

Form

Strain-verified 35624 capsule

Timing

With a meal

Notes

Track abdominal pain, bloating, stool form, and global relief.

Population

Seek care for alarm symptoms or new bowel changes after age 50.

Bifidobacterium infantis 35624for Bloating and Gas

Dose

1 billion CFU daily

Form

35624 capsule

Timing

With breakfast

Notes

Initial gas can occur but persistent worsening means stop.

Population

Consider FODMAP assessment if bloating is severe.

Bifidobacterium longum BB536for Constipation Support

Dose

5-20 billion CFU daily for 4-12 weeks

Form

BB536 capsule or sachet

Timing

With breakfast

Notes

Assess bowel frequency, stool form, and bloating over several weeks.

Population

New constipation in older adults or alarm symptoms require medical evaluation.

Bifidobacterium longum BB536for Microbiome Support

Dose

1-10 billion CFU daily

Form

Strain-verified BB536 product

Timing

With meals

Notes

Benefits are strain-specific and often fade after stopping.

Population

Avoid in severe immunocompromise unless supervised.

Chamomilefor Nervous Stomach

Dose

1 cup tea up to three times daily

Form

Dried flower tea

Timing

After meals or between meals

Notes

Persistent GI symptoms need medical assessment.

Population

Avoid if allergic to Asteraceae plants.

Deglycyrrhizinated Licorice (DGL)for Reflux-Related Discomfort

Dose

350-760 mg before meals as chewable DGL

Form

Chewable DGL

Timing

15-20 minutes before meals

Notes

Use for occasional symptoms; persistent reflux needs evaluation and may need evidence-based therapy.

Population

Alarm symptoms such as dysphagia, bleeding, anemia, or weight loss need urgent evaluation.

Fructooligosaccharides (FOS)for Constipation Support

Dose

3-10 g daily if tolerated

Form

FOS or oligofructose blend

Timing

With breakfast and fluids

Notes

PHGG or psyllium may be better for gas-sensitive users.

Population

Alarm symptoms need medical evaluation.

Galactooligosaccharides (GOS)for Constipation Support

Dose

2.5-5.5 g daily

Form

GOS powder

Timing

With breakfast and fluids

Notes

Use with adequate hydration and total dietary fiber.

Population

New severe constipation or alarm symptoms require medical evaluation.

Galactooligosaccharides (GOS)for IBS Support

Dose

1.4-2.8 g daily initially

Form

B-GOS sachet

Timing

With meals

Notes

May help selected IBS users but can worsen gas in others.

Population

Coordinate with low-FODMAP reintroduction if following a restrictive diet.

Inulinfor Constipation Support

Dose

5-10 g daily

Form

Inulin powder

Timing

With breakfast and fluids

Notes

Works best with adequate hydration and dietary fiber diversity.

Population

New or severe constipation requires medical review.

Lactobacillus acidophilus NCFMfor Bloating Support

Dose

1-10 billion CFU NCFM daily, often in a combination product

Form

NCFM plus compatible bifidobacterium blend

Timing

With meals

Notes

Evidence is formulation-specific and mixed; stop if bloating worsens persistently.

Population

Evaluate severe or new bloating, weight loss, bleeding, or anemia.

Lactobacillus acidophilus NCFMfor Lactose Digestion Support

Dose

Product-specific CFU with dairy meal

Form

NCFM fermented dairy or capsule

Timing

With lactose-containing food

Notes

Best used as adjunct to lactose management; lactase enzyme may be more direct.

Population

Milk allergy is different from lactose intolerance and requires avoidance.

Lactobacillus acidophilus NCFMfor Gut Microbiome Support

Dose

1-10 billion CFU daily

Form

Strain-verified NCFM capsule

Timing

With food

Notes

Effects may require ongoing intake and are not permanent colonization.

Population

Avoid in severe immunocompromise unless supervised.

Lactobacillus plantarum 299vfor IBS Bloating and Pain

Dose

10 billion CFU daily for 4-12 weeks

Form

Strain-verified capsule

Timing

With breakfast or dinner

Notes

Assess response after at least 4 weeks; discontinue if symptoms worsen persistently.

Population

Alarm GI symptoms require medical evaluation.

Lactobacillus plantarum 299vfor Gut Microbiome Support

Dose

1-10 billion CFU daily

Form

299v capsule or tablet

Timing

With meals

Notes

Effects are strain-specific and may not persist after stopping.

Population

Avoid in severe immunocompromise unless clinician-supervised.

Lactoferrinfor Gut Immune Barrier Support

Dose

100-300 mg/day

Form

Apolactoferrin or bovine lactoferrin

Timing

With or without food

Notes

May pair with microbiome support; evidence varies.

Population

Persistent GI symptoms need evaluation.

Lemon Balmfor Nervous Stomach

Dose

Tea 1-3 times daily or 300 mg extract

Form

Dried leaf tea

Timing

Between meals or after meals

Notes

May soothe stress-related digestive tension; persistent pain, bleeding, weight loss, or vomiting needs medical assessment.

Population

Mint-family botanicals can worsen reflux in some people.

Marshmallow Rootfor Reflux Irritation Support

Dose

1-3 g powder or infusion before meals

Form

Cold infusion or powder slurry

Timing

Before meals, away from medications

Notes

May soothe irritation but does not treat GERD causes or replace indicated therapy.

Population

Alarm reflux symptoms require evaluation.

Partially Hydrolyzed Guar Gum (Sunfiber)for Bowel Regularity

Dose

3-6 g daily

Form

PHGG powder

Timing

With a meal or beverage

Notes

Increase by 1-2 g every several days to reduce bloating.

Population

Seek care for blood in stool, unexplained weight loss, severe pain, or new bowel changes.

Partially Hydrolyzed Guar Gum (Sunfiber)for IBS Support

Dose

5-6 g daily

Form

Sunfiber-type PHGG

Timing

With breakfast or dinner

Notes

Often better tolerated than rapidly fermented fibers, but individual FODMAP sensitivity varies.

Population

Use alongside medical IBS care and diet personalization.

Partially Hydrolyzed Guar Gum (Sunfiber)for Microbiome Support

Dose

3-10 g daily

Form

PHGG powder

Timing

Any consistent time with fluid

Notes

Benefits require consistent use over weeks.

Population

Start low after recent antibiotics or during active GI flares.

Peppermint Oil (Enteric-Coated)for IBS Abdominal Pain

Dose

0.2-0.4 mL enteric-coated oil two or three times daily

Form

Enteric-coated capsule

Timing

30-60 minutes before meals

Notes

Use for short-term symptom relief; persistent or severe pain requires evaluation.

Population

Avoid if reflux worsens.

Peppermint Oil (Enteric-Coated)for Bloating and Gas Discomfort

Dose

Product-specific enteric-coated dose before meals

Form

Triple-coated microsphere capsule

Timing

Before meals

Notes

Most useful when bloating is spasm-related; fermentation-related bloating may need diet changes.

Population

Gallbladder disease needs clinician review.

Slippery Elmfor Reflux Irritation Support

Dose

1-2 g powder in water before or between meals

Form

Hydrated inner bark powder

Timing

At least 2 hours away from medications

Notes

May soothe irritation but does not treat GERD causes or reduce acid production.

Population

Alarm symptoms need medical evaluation.

Sodium Butyratefor Gut Health

Dose

300-1200 mg butyrate daily (divided)

Form

Enteric-coated / sustained-release capsule

Timing

With meals, split into two to three doses

Notes

Aimed at supporting the intestinal barrier and feeding colonocytes. Evidence in humans is preliminary; benefits are most plausible when endogenous fiber-derived butyrate is low. Pair with adequate dietary fiber, which is the body's main butyrate source.

Population

People on sodium-restricted diets should account for the sodium load or favor tributyrin.

Claim deep dives

For gut health, reviewed.

Each claim opens to the strongest PubMed-cited studies, the contrary evidence, and a plain recommendation.

No claim deep dives published for this goal yet.

Stack safety

Where this stack might fight itself.

Common conflicts in this category, plus how many documented interactions touch these substances.

Where this stack fights itself

Bulk fibers like psyllium can blunt absorption of medications taken at the same time, and probiotics need a few hours of separation from antibiotics. The checker flags every timing-sensitive pairing.

In the database

233 documented pairings touch at least one of these substances.
Scan a full routine for additive or conflicting effects before you combine.

Open the free interaction checker →

Weaker evidence

Commonly suggested, thinner proof.

These are marketed for this goal but rate emerging, limited, or insufficient in the NutriStack library. Thin evidence is not the same as disproven; it means the human data is early or mixed. Treat them as experiments, not staples.

Supplement	Evidence	Why it is on the watch list
Betaine HCL	Emerging	Supplemental hydrochloric acid for people with low stomach acid (hypochlorhydria).
Colostrum	Emerging	First milk containing concentrated immunoglobulins, growth factors, and lactoferrin.
Lactobacillus acidophilus NCFM	Emerging	Lactobacillus acidophilus NCFM is a well-studied probiotic strain used in dairy products and supplements. Human trials have tested it for bloating,...
Sodium Butyrate	Emerging	Sodium butyrate is the sodium salt of butyric acid, a four-carbon short-chain fatty acid (SCFA) normally produced when gut bacteria ferment dietary...

FAQ

Common gut health questions.

Quick answers drawn from the rankings and dosing above.

What are the best supplements for gut health?

The best-evidenced options for gut health in the NutriStack library are Berberine, Ginger Extract, Lactobacillus Rhamnosus, and Probiotics. Each is ranked by its own evidence tier and links to a full profile with dosing, forms, and PubMed-cited sources.

What dose of probiotics is used for gut health?

For general gut support, trials typically used Probiotics at 10-20 billion CFU daily (with food if the product suggests it). Doses are general ranges from the underlying trials, not personalized advice; confirm on the full profile and with a clinician.

Are gut health supplements safe to take together?

Bulk fibers like psyllium can blunt absorption of medications taken at the same time, and probiotics need a few hours of separation from antibiotics. The checker flags every timing-sensitive pairing. 233 documented pairings in the database touch at least one of these substances, so scan a full routine with the free interaction checker before combining.

Which gut health supplements have weak evidence?

Commonly marketed for gut health but resting on emerging, limited, or insufficient evidence: Betaine HCL, Colostrum, Lactobacillus acidophilus NCFM, and Sodium Butyrate. Thin evidence means the human data is early or mixed, not that the supplement is disproven.

Build your stack

Every ranking traces to a primary source.

These hubs come from the same library that powers the NutriStack app. Open any supplement for full dosing, forms, interactions, and citations.

Download on the App Store → Browse the research library

Gut supplements with strain-level and trial-level evidence.

Ranked by evidence, top first.

Dose and timing, from the trials.

For gut health, reviewed.

Where this stack might fight itself.

Where this stack fights itself

In the database

Commonly suggested, thinner proof.

The other goal hubs.

Common gut health questions.

What are the best supplements for gut health?

What dose of probiotics is used for gut health?

Are gut health supplements safe to take together?

Which gut health supplements have weak evidence?

Every ranking traces to a primary source.