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Top Picks — Gut Health

🦠 Best Gut Health Supplements

Prebiotics, probiotics, and gut barrier ingredients ranked by clinical evidence for microbiome health and digestive wellness, with some studied in IBS.

193 ingredients reviewed Ranked by clinical evidence
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Top 5 — Ranked by Evidence

Strong
Lactobacillus rhamnosus GG (LGG)
Digestive Support During Antibiotic Use in Children
10–20 billion CFU/day; 5–10 billion CFU/day commonly used in pediatric protocols
Strong
Saccharomyces boulardii
Digestive support during antibiotic use
250–500 mg twice daily (5–10 billion CFU/day); 250 mg three times daily for C. diffic
Very Strong
Psyllium Husk (Plantago ovata)
Stool water, stool output and bowel movement frequency
5–15 g/day psyllium husk (1–3 teaspoons); FDA cholesterol claim requires ≥7 g/day; ta
Strong
Limosilactobacillus reuteri DSM 17938 (BioGaia Protectis®)
Fewer spit-ups and better gut motility in infants
Infants: 100 million CFU (1×10⁸) once daily as drops (BioGaia Protectis® dosing). Chi
Moderate
Inulin
More Bifidobacteria in the Gut
2–10 g/day for prebiotic/gut microbiome effects; gradual dose increase recommended to

📈 Fastest Growing Gut Health Ingredients

Postbiotic, fiber, and strain-specific ingredients gaining traction with formulators in 2024–2026.

Trending
Moderate
Sunfiber® (Partially Hydrolyzed Guar Gum)
Less bloating and gas
5-6 g/day in the IBS trials; 10 g/day in the type 2 diabetes trial; up to 15 g/day in the…
Trending
Limited
EpiCor® (Postbiotic Yeast Fermentate — Cargill)
Digestive comfort and bowel regularity
500 mg/day.
Trending
Strong
Lactobacillus rhamnosus GG (LGG)
Digestive Support During Antibiotic Use in Children
Children on antibiotics: L. rhamnosus or S. boulardii at 5 to 40 billion CFU/day (Cochrane).…

🔬 Future Gut Health Ingredients to Watch

Lower current evidence but active research underway — these may become top picks within 2–3 years.

Watch
Limited
Akkermansia muciniphila
Gut barrier integrity
10^10 cells/day of the pasteurized form was the amount used in the single human trial. Many…
Watch
Limited
AstraGin® (Astragalus and Notoginseng Saponin Extract)
Intestinal absorption of amino acids from whey protein
50 mg twice daily (100 mg/day) in both supplementation trials; the two acute absorption tests…
Watch
Limited
Arabinoxylan (Arrabina®)
Prebiotic feeding of bifidobacteria
Trials of other arabinoxylans used 15 g/day for 6 weeks (impaired glucose tolerance), 6 or 12…

All Gut Health Ingredients (193)

Strong
Lactobacillus rhamnosus GG (LGG)
Digestive Support During Antibiotic Use in Children
10–20 billion CFU/day; 5–10 billion CFU/day commonly used in pediatric protocols
Strong
Saccharomyces boulardii
Digestive support during antibiotic use
250–500 mg twice daily (5–10 billion CFU/day); 250 mg three times daily for C. diffic
Very Strong
Psyllium Husk (Plantago ovata)
Stool water, stool output and bowel movement frequency
5–15 g/day psyllium husk (1–3 teaspoons); FDA cholesterol claim requires ≥7 g/day; ta
Strong
Limosilactobacillus reuteri DSM 17938 (BioGaia Protectis®)
Fewer spit-ups and better gut motility in infants
Infants: 100 million CFU (1×10⁸) once daily as drops (BioGaia Protectis® dosing). Chi
Moderate
Inulin
More Bifidobacteria in the Gut
2–10 g/day for prebiotic/gut microbiome effects; gradual dose increase recommended to
Moderate
Peppermint (Mentha × piperita)
Overall gut comfort and bowel symptoms
IBS trials: enteric-coated or sustained-release peppermint oil, such as 180 mg three
Moderate
Probiotics (Multi-strain Blends)
Digestive support during antibiotic courses
1–10 billion CFU/day maintenance; up to 50 billion CFU/day therapeutic
Moderate
Curcumin/Turmeric
Digestive Health Benefits
About 1,000 to 1,500 mg/day of extract in divided doses in knee joint trials; most
Moderate
Lactulose (Synthetic Disaccharide Laxative)
Supports regular bowel movements and softer stool
Prebiotic trials 2-10 g/day; laxative 10-20 g/day, up to 40 g; hepatic encephalopathy
Moderate
Resistant Dextrin (Resistant Maltodextrin)
More regular bowel movements and stool volume
Post-meal glucose and fat tests: 5 to 10 g with a meal. Bowel trials: about 4 to 15
Strong
Bifidobacterium bifidum
Digestive comfort — MIMBb75 studied in IBS with high-quality evidence
IBS (live MIMBb75): 1×10⁹ CFU/day for 4+ weeks; IBS (heat-inactivated MIMBb75 / SYN-H
Moderate
Bifidobacterium animalis subsp. lactis (BB-12 / HN019)
Constipation relief and bowel regularity
1–10 billion CFU/day (BB-12); 17.2 billion CFU/day (HN019 in constipation studies)
Strong
Escherichia coli Nissle 1917 (Mutaflor®)
Anti-inflammatory gut effects
Ulcerative colitis maintenance: 100 mg twice daily (5×10⁹ CFU/capsule × 2/day) per Mu
Strong
FOS (Fructo-Oligosaccharides)
Selective Bifidobacterium Stimulation (Bifidogenic Effect)
5-15 g/day; gradual introduction (start 2-3 g/day, titrate to tolerance) due to GI fe
Strong
Lactase (β-Galactosidase)
Better digestion of the lactose in a dairy meal
About 3,000 or 6,000 units taken with milk containing 20 g lactose; the EU claim requires at least 4,500 FCC units with each lactose-containing meal.
Strong
Magnesium Citrate
Osmotic laxative and bowel cleansing effect
200–400 mg elemental magnesium/day for general supplementation; 150–300 mL of 1.745 g
Strong
BarleyTrim® (Barley Beta-Glucan)
Digestive and gut health
About 3 grams of barley beta-glucan per day for cholesterol benefit.
Strong
Glucomannan (Konjac Root Fiber)
Bowel regularity and gut bacteria
About 3 g/day (1 g three times daily before meals) in the cholesterol meta-analysis; always take with a large glass of water.
Moderate
Bacillus coagulans (Weizmannia coagulans)
Abdominal discomfort, bloating and stool form
1 to 2 billion CFU once daily for 4 weeks to 90 days: 2 billion for Unique IS2 and
Moderate
Partially Hydrolyzed Guar Gum (PHGG)
Bowel regularity
5 to 6 g/day in most adult trials (5 g/day in the stool-form, care-home and
Moderate
Kiwifruit (Actinidia deliciosa)
Bowel regularity with two green kiwifruit a day
Whole fruit: 2 green kiwifruit a day (about 200 g flesh) for 4 weeks in bowel trials;
Moderate
Sunfiber® (Partially Hydrolyzed Guar Gum)
Less bloating and gas
5-7 g/day for digestive applications; up to 21 g/day in some clinical trials; pediatr
Moderate
Bacillus clausii (Enterogermina® / Erceflora)
Gut recovery support: shorter loose-stool spells in young children
Standard dose: 2 billion spores (2×10⁹ CFU) 2-3 times daily as oral suspension. AAD p
Moderate
Alpha-Galactosidase
Less gas and bloating after a meal high in raffinose-family sugars (beans, legumes,…
300 or 1,200 GalU with a 420 g cooked-bean meal in healthy volunteers; retail products list 150 to 1,200 GalU per serving.
Moderate
Dried Plum (Prunes, Prunus domestica)
Stool frequency and consistency with daily prunes
Bowel trials: 50 g of prunes twice daily (100 g/day) for 3 weeks, 80 or 120 g/day for
Moderate
Fibalance® (Partially Hydrolyzed Guar Gum)
Less bloating and gas
5-10 g/day; clinical trials commonly 5-6 g/day
Moderate
GutGard® (Deglycyrrhizinated Licorice — Natural Remedies)
Heartburn and regurgitation
Around 150 mg per day.
Moderate
Menthol
Digestive comfort: abdominal pain and bowel symptoms (peppermint oil)
IBS (enteric-coated peppermint oil): 180-225 mg three times daily; menthol is only one component of peppermint oil, and no cited trial tested isolated menthol.
Limited
L-Glutamine
Post-infection IBS with diarrhea: one unrepeated trial
Trial dose: 5 g three times daily for 8 weeks.
Moderate
Artichoke Leaf (Cynara scolymus / Cynara cardunculus)
Digestive Comfort and Indigestion
Indigestion trial: 640 mg leaf extract three times daily (1,920 mg a day) for 6 weeks.
Moderate
Digestive Enzyme Blends (DigeZyme® and similar)
Indigestion and stomach comfort after meals
50–150 mg/day DigeZyme® (providing standardized enzyme activity); taken with meals fo
Moderate
EcoGuar® (Partially Hydrolyzed Guar Gum)
Digestive regularity and microbiome
Commonly 5 to 7 grams per day.
Moderate
Gingever® (High-Potency Ginger Extract — OmniActive)
Occasional constipation
280 mg/day Gingever (Eraiah 2024 constipation trial, taken nightly after dinner for 8
Moderate
GOS (Galacto-Oligosaccharides)
Strong Bifidogenic Effect (Infant and Adult)
Cited studies used 5 g a day (calcium absorption) and 15 g a day (prediabetes); products commonly supply 2.5 to 15 g a day.
Moderate
Lactobacillus reuteri
Infant digestive comfort: less crying in breastfed babies (DSM 17938)
10^8 CFU/day (DSM 17938 for infant colic); 2.9×10^9 CFU/day (NCIMB 30242 for choleste
Moderate
LactoSpore® (Heat-Stable Bacillus coagulans MTCC 5856 — Sabinsa)
Bowel comfort, gas and bloating in placebo-controlled trials
1–4 billion CFU/day LactoSpore® Bacillus coagulans; IBS and gut health: 2 billion CFU
Moderate
Pectin (Apple and Citrus Pectin)
Bowel regularity and colonic transit
6 g/day (EU cholesterol claim) up to 15 g/day in cholesterol trials; 10 g with a meal
Moderate
Senna
Short-term bowel movement frequency and symptom relief
EU monograph: 10 to 30 mg hydroxyanthracene derivatives (as sennoside B) once daily at
Limited
Lactobacillus casei
Constipation-related symptoms in women after childbirth
The one cited study used a daily fermented milk drink with L. casei Shirota, not a capsule; labels commonly provide about 1 to 10 billion CFU a day. Higher C. difficile doses involve different strains.
Moderate
Amla (Indian Gooseberry)
Less frequent and milder heartburn and regurgitation in one trial
Reflux symptoms: two 500 mg amla tablets twice daily after meals (2 g a day) for 4
Moderate
Bioferrin® (Lactoferrin — Glanbia)
Gut health in children's lactoferrin trials
100-1000 mg/day lactoferrin (varies by application; immune support typical 100-300 mg
Moderate
Black Seed Oil
Indigestion and upper-stomach comfort
5 mL of oil a day in a honey formulation for 8 weeks, as studied in functional
Moderate
Fibersol® (Digestion-Resistant Maltodextrin — ADM/Matsutani)
Gut bacteria and butyrate fermentation
Commonly 5 to 10 grams per day.
Moderate
Magnesium Oxide
Constipation/Laxative
400–800 mg magnesium oxide/day for supplementation (delivers ~100–250 mg actually abs
Moderate
Resistant Starch
Butyrate production in the colon
GUT/MICROBIOME: 15-30 g/day (1-2 tbsp Hi-Maize® or raw potato starch). T2D METABOLIC:
Moderate
Brox-25® (Bromelain)
Digestive enzyme support
Commonly 200 to 500 mg (or defined enzyme-activity units) per day.
Moderate
GingerWarmer® (Ginger Extract)
Digestive support
Commonly around 1 gram of ginger per day.
Moderate
Ginginoll® (Ginger Extract — Akay)
Digestive support
Commonly around 1 gram of ginger per day.
Moderate
Phytase
Digestive comfort is not established
Labels commonly list 500 to 1,500 FTU per serving. In absorption studies, 20 to 320 phytase units per 100 g of flour improved iron absorption, with the enzyme mixed into food rather than a capsule.
Moderate
Prodiet® Lactoferrin (Native Bovine Lactoferrin — Ingredia)
Gut health
Commonly 100 to 200 mg per day.
Limited
Consolax® (Soluble and Insoluble Fiber Blend — Zeus Hygia)
Bowel regularity
Zeus Hygia suggests 1.8 g twice a day, about 3.6 g of fiber daily. No dose of Consolax itself has been tested; the cited studies used more, 5 g twice daily.
Limited
Dairylytic® (Lactase Enzyme)
Lactose digestion
Taken with dairy meals; dose measured in enzyme activity units (FCC).
Limited
Butyrate (Sodium and Calcium Butyrate)
Bowel habits and abdominal discomfort in adults
300 mg/day sodium butyrate (150 mg twice daily) in common coated products; 600 mg/day
Limited
Limosilactobacillus fermentum (Lactobacillus fermentum)
Digestive comfort during antibiotic therapy (strain MN-LF23)
Strain-specific: 1 x 10^9 to 1.26 x 10^10 CFU/day of VRI-003 (PCC) in athletes; 1 x
Limited
Banana (Musa species)
Stool output and recovery time with cooked green banana in infant diets
Ripe fruit: 0.2 g/kg of carbohydrate every 15 minutes during 75 km cycling; 150 or 300
Limited
Chicory Root (Cichorium intybus)
Bowel regularity and softer stools with dried whole root
Dried whole root: 15 g/day for 2 weeks, then 30 g/day for 3 to 10 weeks. Roasted root
Limited
Lactobacillus helveticus (Probiotic Species)
Bowel habits in trials of specific strains and fermented milk
3 to 10 billion CFU/day of R0052 with B. longum R0175; 8 billion CFU/day of R0052 with
Limited
Polydextrose (Soluble Glucose-Polymer Fiber)
Gut bacteria shifts as a prebiotic fiber
Appetite tests used 6.3 to 25 g in a single snack, drink or meal; a body fat trial
Limited
Bacteriophage Prebiotics (Phage Blends)
Lowers E. coli levels within the gut microbiota
About 15 mg a day of a phage blend (roughly one million PFU), taken for four weeks,
Limited
Clostridium butyricum MIYAIRI 588 (CBM588 / MIYA-BM® / Butirrisan®)
Butyrate production in the gut
20-80 mg/day MIYA-BM powder (1-4×10⁸ CFU) is the range cited for the Japanese prescription product. No adult dose is established here: the diarrhea study was in children and the cancer trials were supervised.
Limited
PreforPro® (Bacteriophage Blend — Deerland)
Lowers E. coli within the gut microbiota
15 mg/day capsule (about 1 million PFU) for 4 weeks, alone or with 1 billion CFU B.
Limited
Acacia Fiber (inavea™ Pure Acacia)
Gentle prebiotic fiber
Nearly all the human evidence used 30 g/day of gum arabic powder for 6 weeks to 3 months. Mild gas, bloating and rumbling are reported around 40 g/day.
Limited
Activated Charcoal
Less intestinal gas after a gas-producing meal
0.52 g four times daily for one week in the one gas study whose abstract gives a dose
Limited
Akkermansia muciniphila
Gut barrier integrity
Depommier 2019: 10¹⁰ CFU/day pasteurized × 3 months. Most products: 10⁸-10⁹ CFU/day.
Limited
Anise Seed (Pimpinella anisum)
After-meal fullness and digestive comfort
Trials: ground seed 3 g three times daily after meals; seed extract capsules 330 mg
Limited
Bifidobacterium infantis 35624 (Align® / Bifantis® / Meta Align®)
Digestive comfort in women: dose-ranging trial
PIVOTAL: 100 million CFU/day (1×10⁸) — narrow window, both 1 million and 10 billion C
Limited
Bifidobacterium longum
Abdominal comfort and bloating (35624 strain)
1–10 billion CFU/day; 1714 strain studies use 1 billion CFU/day for psychobiotic effe
Limited
ButiShield™ (Encapsulated Butyric Acid for Gut)
Digestive comfort in adults with mild GI symptoms
Per Kemin product specification
Limited
DE111® (Bacillus subtilis Probiotic — ADM Deerland)
Gut bacteria balance in preschool children
Commonly 1 billion CFU per day.
Limited
Enterococcus faecium SF68® (Bioflorin / Cernivet)
Studied in 1,143 people with acute infectious diarrhea
Three times daily for 7 days in acute diarrhea, twice daily for 7 days with antibiotics; the live bacteria count is not stated and no dose is tested for general use.
Limited
Fibruline® (Chicory Inulin — Cosucra)
Gut bifidobacteria with Fibruline Instant versus placebo
Fibruline Instant: 7.7 then 15.4 g/day in snack bars for 3 weeks, about 20 g/day for 4
Limited
Fig (Ficus carica)
Bowel transit time and stool form with daily fig paste
Fruit: paste 300 g/day for 8 weeks; about 90 g/day for 4 months; dried figs 120 g/day
Limited
Lactobacillus acidophilus
IBS: no change in abdominal pain, small change in flatus
1–10 billion CFU/day for general use; up to 50 billion CFU/day in IBS or vaginal heal
Limited
Lactobacillus plantarum
Abdominal pain and bloating (strain 299v)
10–50 billion CFU/day; 299v strain typically 20 billion CFU/day; weight management st
Limited
Limonene (D-Limonene)
Occasional heartburn: patent-reported studies
About 10 mg/kg/day (roughly 700 mg for a 70 kg adult) in the inflammation trial; 2 g/day in the breast tissue study; the 1,000 mg heartburn doses come from unpublished patent studies.
Limited
Optibiome® BS50 (Bacillus subtilis MB40 — BIO-CAT Microbials)
Decreased gastrointestinal symptoms in healthy adults
Per BIO-CAT Optibiome BS50 product specification
Limited
Streptococcus thermophilus (Specific Strains)
Lactose digestion improvement
ST81: 3 billion CFU/day. ST36: similar consumer dose. AAD prevention combination with
Limited
Tormentil Root (Potentilla erecta)
Loose-stool duration in a 40-child placebo-controlled trial
Adults: 1,200 to 3,000 mg/day of an ethanolic dry extract in 3-week steps
Limited
Triphala (Three-Fruit Ayurvedic Blend)
Stool output and bowel habits in an Indian outpatient trial
Powder: 2.5 g twice daily (5 g/day) for about a month in the bowel-habit trial.
Limited
Yacon Syrup
Prebiotic fiber for gut bacteria
0.14 g FOS/kg/day (roughly 10 g FOS, or 20 to 25 g of syrup for a 70-kg adult) in the single 120-day trial; the higher 0.29 g FOS/kg/day dose caused digestive side effects.
Strong
Ginger (Zingiber officinale)
Digestive comfort and stomach emptying
Nausea in pregnancy: about 1 g a day (a review favored under 1,500 mg). With
Strong
Melatonin
Heartburn as an add-on to acid-reducing medicine
Heartburn: 3 mg/day (sublingual, added to omeprazole 20 mg, 4 weeks). Sleep: pooled
Limited
Actazin® (Kiwifruit Extract — Anagenix)
Digestive regularity
About 600 mg to 2.4 g per day, depending on the goal.
Limited
Aminogen® (Protease Enzyme Blend — Deerland)
Improved protein digestion
Labels typically provide 250 to 500 mg with a protein meal; trials used 2.5 g or 5 g of the enzyme blend, and no published trial has tested whether 250 to 500 mg works.
Limited
Asafin® (Asafoetida Gum for Gut Health — Akay Bioactives)
Indigestion symptom scores in a 30-day placebo-controlled trial
250 mg twice daily (about 180 mg asafoetida gum a day) for 30 days, or 250 mg once
Limited
Asafoetida (Ferula assa-foetida)
Indigestion symptom scores in a 30-day placebo-controlled trial
250 mg twice daily (about 180 mg asafoetida gum a day) for 30 days, or 250 mg once
Limited
Avocado (Persea americana)
Gut microbiota composition with a daily avocado
One Hass avocado a day (about 136 g of flesh in the feeding trial, 140 to 180 g in
Limited
Bacillus subtilis
Bowel regularity and stool consistency
1–10 billion CFU/day; DE111 commonly dosed at 1 billion CFU/day
Limited
Beef Pancreas (Desiccated)
Natural digestive enzyme content
Typical supplementation: 1.5-3 g/day (2-4 capsules at 750 mg each) desiccated beef pa
Limited
Cellulase
Reduced bloating and gas from raw vegetables and high-fiber foods
300–1,500 CU per meal; typical multi-enzyme blends contain 500–2,000 CU per dose
Limited
Faecalibacterium prausnitzii (Next-Generation Probiotic)
Gut barrier strengthening
Clinical trial doses: typically 1-10 billion CFU/day in oxygen-protected formulations
Limited
Fibregum™ (Prebiotic Acacia Gum)
Generally Good Digestive Tolerance
Trials used 5, 10, 20, 30 and 40 g/day; about 10 g/day was optimal in the one dose-response study. 30-40 g/day has caused GI symptoms.
Limited
inavea™ BAOBAB ACACIA
Prebiotic Activity in a Laboratory Gut Model
5 g/day (synergistic dose; lower than individual ingredients alone)
Limited
inavea™ CAROB ACACIA
Microbiota Diversity Enhancement
5 g/day (research-validated for microbiome diversity effects)
Limited
Larch Arabinogalactan (Larix Fiber)
Shifts in gut bacteria composition
About 1.5 to 4.5 g/day in the immune and vaccine studies and 15 g/day in the gut
Limited
Mango Fruit (Mangifera indica)
Gut microbiome diversity compared with a calorie-matched snack
Fresh or frozen mango: 100 kcal a day (about 1 cup) for 12 weeks; two 1-cup servings a
Limited
Mastic Gum (Pistacia lentiscus var. chia)
Upper digestive comfort after meals
350 mg three times daily (about 1 g/day) for 3 weeks in the main digestive trial; 1.4
Limited
MicrobiomeX® (Citrus Flavonoid Extract — BioActor)
Shifts gut fatty acids toward butyrate
500 mg/day (studied 250-500 mg)
Limited
MucoSave® FG (Prickly Pear and Olive Extract — Bionap)
Digestive comfort scores in healthy adults (one trial, 400 mg alone)
6 grams per day of a blend in the one trial; the roughly 200 mg per day figure often quoted is far below the amount actually studied.
Limited
Papaya (Carica papaya)
Digestive comfort with a papaya fruit concentrate
By preparation. Fermented papaya preparation: 6 to 9 g a day for 3 to 14 weeks in
Limited
PepZinGI® (Zinc-Carnosine for Gut Lining)
Gut permeability under an NSAID or exercise challenge
75–150 mg/day PepZinGI® (polaprezinc); 75 mg twice daily was the Japanese ulcer-drug dose; estab
Limited
Prickly Pear Cactus (Opuntia ficus-indica)
Bowel symptom relief with nopal fiber powder
Depends on the plant part: about 300 g cooked nopal pads with a meal; pad fiber 3 g a
Limited
Purslane (Portulaca oleracea)
Bowel regularity and digestive comfort scores
Seeds: 10 g/day for 5 to 8 weeks (with yogurt or as sachets); 1 g/day of seed powder
Limited
Tolerase® G (AN-PEP Gluten-Digesting Enzyme — DSM)
Breaks down gluten in the stomach
With gluten-containing meals
Limited
Transglucosidase (Prebiotic Enzyme)
Shifts gut microbiota and short-chain fatty acids
Taken with meals. The type 2 diabetes trials used 300 or 900 mg a day of the enzyme
Limited
Tributyrin (CoreBiome® Butyrate Prodrug)
Colonic butyrate delivery vs free butyrate (laboratory gut simulator, not people)
300 to 1,000 mg/day with meals is the CoreBiome label range; no dose of CoreBiome has been tested for benefit in people.
Limited
Zeolite (Clinoptilolite)
Gut barrier marker shifted in endurance athletes
1-9 g/day in human studies; most often 2 g once to three times daily (up to 6 g/day);
Limited
Aloe Vera (Aloe barbadensis miller)
Digestive comfort
Blood sugar trials: 0.2 to 2.8 g a day of aloe powder or capsules, or aloe juice, for
Limited
Asdamarin™
Digestive symptom and quality of life scores in a 7-day trial
250 mg twice daily after meals for 7 days in the one published human trial (each
Limited
AstraGin® (Astragalus and Notoginseng Saponin Extract)
Intestinal absorption of amino acids from whey protein
50 mg twice daily (100 mg/day) in both supplementation trials; the two acute absorption tests gave 50 mg the night before and 50 mg with the test drink.
Limited
BeneGut® (Perilla Extract — Vital Solutions)
Digestive comfort
Around 150 to 300 mg of extract per day.
Limited
Biotis® GOS (Galacto-Oligosaccharides — FrieslandCampina)
Regularity and stool comfort
Commonly a few grams per day.
Limited
Common Mallow (Malva sylvestris)
Bowel movement frequency and stool form in a placebo trial of flower syrup
Placebo trial: 1 g a day of flower water extract as syrup (10 ml twice daily) for 4
Limited
Dietary Nucleotides (Nucleotide Supplements)
Gut comfort ratings in adults with sensitive bowels
Adult trials: 480 mg/day of a free-nucleotide blend for 30 days; 50 mg/day under the
Limited
effera® (Human-Identical Lactoferrin)
Gut bacteria and fecal short-chain fatty acids
No established effera® dose; the cited human trials used bovine lactoferrin at 200 to 600 mg a day, not effera® itself.
Limited
FiberSMART® (Soluble Tapioca Fiber — Anderson)
Fiber and digestive support
The one supporting human study used 6 g a day of maize soluble fiber; finished products list servings as several grams of fiber, which may be more or less than the amount studied.
Limited
GlucoVantage® (Dihydroberberine)
Gut microbiome support
100–200 mg/day before meals; the only human study gave single 100 mg or 200 mg doses, so no trial has established an effective daily dose.
Limited
Guava Leaf (Psidium guajava)
Return to normal stools sooner in adults with loose stools
Tea: 190 to 200 mL (about 400 mg of aqueous leaf extract) with each meal, three times
Limited
iXOS® (Xylooligosaccharides Prebiotic)
Microbiome composition shifts, with limited measured health outcomes
1.4 and 2.8 g/day in the bifidobacteria trial, 2 g/day for prediabetes, 4 g/day for type 2 diabetes, 5 g/day and 8 g/day in immune trials; no trial tested the iXOS brand.
Limited
Juniper Berry (Juniperus communis)
Eases bloating, fullness and upper abdominal discomfort
Dried berry tea 2-2.5 g per cup, 2.5-10 g/day (EMA traditional use); juniper berry oil
Limited
KiOtransine® (Chitin-Glucan Prebiotic Fiber — KitoZyme)
Gut microbiome support
Commonly a few grams per day.
Limited
Lactobacillus salivarius (Multi-Strain)
Ls-33 obesity / gut barrier
Oral health (WB21): 2.0×10⁹ CFU/day; periodontal (CP3365): three tablets a day, 4.4 billion cells each, heat-killed. Match strain to indication.
Limited
LBiome™ (Lactobacillus LB Postbiotic — Stratum Nutrition)
Microbiome Modulation
No adult dose is established by the studies cited here; the published trials used the heat-killed preparation in children during an acute illness.
Limited
Lipase
Fat digestion and steatorrhea in diagnosed pancreatic insufficiency
Healthy-adult trials used 280 mg acid-resistant lipase before a fatty meal, or three pancrelipase capsules with a meal. Prescription replacement is 10,000 to 80,000 USP lipase units per meal.
Limited
Odilia™
Gut microbiome composition
300 mg once a day; the single randomized trial used 300 mg a day for 8 weeks, and nothing is known about other doses or longer use.
Limited
GluteAX® (Gluten-Targeting Enzyme — BIO-CAT)
Alpha-gliadin 33-mer peptide digestion
Per BIO-CAT GluteAX product specification
Limited
Optiziome® P3 Hydrolyzer® (Protease Blend — BIO-CAT)
Protein digestion: 14% higher blood EAA, 15% BCAA after whey (one acute trial)
Per BIO-CAT P3 Hydrolyzer product specification
Limited
ResistAid® (Larch Arabinogalactan — Lonza)
Gut Microbiome Modulation
1.5-4.5 g/day ResistAid (research-validated)
Limited
Rhubarb Root (Rheum palmatum)
Bowel movement frequency and stool consistency over 30 days
Trial: rhubarb root extract tablets giving 12.5 or 25 mg hydroxyanthracene derivatives
Limited
Trpti™ (Bioavailable OEA for Metabolic/Gut Health)
Intestinal barrier marker (occludin) higher at 12 weeks
300 mg/day (delivering 250 mg OEA) as two 150 mg capsules; a 150 mg/day dose is also described, but only in an unpublished, unverified manufacturer study.
Limited
Turkey Tail Mushroom
Gut microbiome support
1–3 g/day PSK extract; 2–9 g/day whole mushroom powder
Limited
VitaFiber® (Isomalto-Oligosaccharide — BioNeutra)
Prebiotic fiber
Used as a fiber and sweetener; a few grams per serving.
Limited
Xanthohumol (Hop Chalcone, Humulus lupulus)
Gut microbiota and bile acid metabolism in healthy adults
24 mg/day for 8 weeks in the two safety trials; single doses of 20 to 180 mg in
Limited
Zinc-L-Carnosine (Polaprezinc)
Gut permeability under an NSAID or exercise challenge
75 mg/day (37.5 mg twice daily) in the NSAID study; 150 mg/day for 4 weeks in the aspirin pilot; 150 or 300 mg/day in the H. pylori trial. Japanese prescription dose 75 mg twice daily.
Strong
Oat Bran (Beta-Glucan)
Bowel regularity in older adults
FDA HEALTH CLAIM: ≥3 g beta-glucan/day (~75 g raw oat bran, ~140 g cooked oatmeal). W
Limited
Arabinoxylan (Arrabina®)
Prebiotic feeding of bifidobacteria
15 g/day for 6 weeks in the impaired-glucose-tolerance trial; 6 to 12 g with a meal in the acute glucose study; 10 g/day AXOS for 3 weeks in the prebiotic study.
Limited
Diamine Oxidase (DAO Enzyme)
Breaks down histamine from food in the gut
Taken right before histamine-rich meals; trials used porcine DAO (about 4.2 mg per
Limited
DPP-IV (Dipeptidyl Peptidase-IV)
Improved digestive comfort in mixed-food sensitivity
500–1,000 DPP-IV units (ALU equivalent) per meal containing potential gluten or casei
Limited
EpiCor® (Postbiotic Yeast Fermentate — Cargill)
Digestive comfort and bowel regularity
500 mg/day EpiCor (research-validated)
Limited
Fennel (Foeniculum vulgare)
Gas and bloating: traditional EU herbal tea use
Trials: 100 mg fennel soft capsules two or three times daily for 8 to 12 weeks; 30 mg
Limited
FenuFibers® (Fenugreek Fiber)
Digestive support
Commonly a few grams of fenugreek fiber per day with meals.
Limited
Gastrap® (Chitin-Glucan for Gas and Bloating — KitoZyme)
Gas and bloating relief
Per the product specification.
Limited
NūGensia™
Gut-barrier support
~10 billion CFU/day
Limited
Progestive® (Bacillus coagulans Probiotic — Nutraceuticals International Group)
Bowel comfort in trials of other B. coagulans strains
Commonly billions of CFU per day.
Limited
Protease (Proteolytic Enzymes)
Improved protein digestion in high-protein meals
Digestive: 30,000–60,000 HUT with meals; Systemic anti-inflammatory: Wobenzym® 3 tabl
Limited
SynBalance® (Probiotic Strains — ROELMI)
Gut health
Commonly billions of CFU per day, depending on the strain.
Limited
Wormwood (Artemisia absinthium)
Bowel symptom scores with a wormwood-containing blend
Trials: 750 mg dried powdered herb three times daily for 6 weeks; a
Preliminary
Ox Bile Extract (Bovine Bile)
Supports fat digestion when bile acids run short
One case report: 2 g conjugated bile acids from ox bile per meal; retail capsules
Limited
Bifidobacterium breve
Gut colonization in preterm babies (hospital use only)
INFANT AD (M-16V Morinaga): 1×10⁹ CFU/day × 1 mo. PRETERM (M-16V): 1×10⁹ CFU/day NICU
Moderate
Berberine
Fewer loose stools and less bowel urgency
500 to 1,500 mg per day, split into 2 or 3 doses with meals. Long-term safety at these
Moderate
Lactobacillus plantarum 299v (Lp299v / LP299V®)
Abdominal pain and bloating comfort
PIVOTAL 10¹⁰ CFU/day (10 billion) Axling 2020 athlete 12 wk + Hoekstra 2021 pregnancy
Limited
Bovine Colostrum
Gut barrier function during hard physical exertion
10-20 g/day for 8-12 weeks in most human trials; a smaller set of trials used 0.5-1.0
Limited
Postbiotics (Heat-Killed and Inactivated Probiotics)
Shifts in gut microbiome composition
Each product has its own studied amount, and none transfers to another: 500 mg a day
Limited
Prodiet® Colostrum (Bovine Colostrum — Ingredia)
Gut barrier function during hard physical exertion
Trials used 20 g/day, 25 g/day, or 3.2 g/day of colostrum powder. Ingredia's suggested minimum, about 0.4 to 0.5 g of powder a day, is far below the amounts used in those trials.
Preliminary
Bacillus licheniformis (Standalone Probiotic)
CDI gut microbiota preservation
Roughly 2-5 x 10^8 CFU per day (hundreds of millions, not billions) of the CMCC63516 strain; the single cited study was in children, so this is not an established adult dose.
Preliminary
Cyperus rotundus (Nutgrass / Musta)
Traditional use as a digestive and carminative herb
1,000 mg/day of a standardized rhizome extract (500 mg plus 5 mg piperine, twice
Preliminary
Hemicellulase (Plant Fiber Digestive Enzyme)
Digests plant cell-wall fibers humans cannot (laboratory work, not people)
No studied dose; labels list about 200 to 2,000 HCU per serving. Health Canada caps it at 45,000 FCC HCU per day.
Preliminary
Kwd+® (Kiwi Extract for Healthy Digestion)
Protein digestion via actinidin
Supplier-suggested 300 mg a day, or 600 mg before a large meal; no published trial has tested either dose, and the cited studies used whole kiwifruit, not this extract.
Limited
Bifidobacterium adolescentis
GABA production in the gut (laboratory and animal finding)
PRL2019: 20 billion CFU once daily for 12 weeks in a pediatric IBS trial; other strains studied at 1 billion to over 100 billion cells daily.
Limited
Colostrum
Gut barrier function during intense exercise
10-20 g/day for 8-12 weeks in most human trials; a smaller set of trials used 0.5-1.0
Limited
Humic Extract
Colonic microbiome modulation (clinical evidence)
Traditional/clinical doses: 100-500 mg/day humic acid extract. No FDA-recognized stan
Limited
Slippery Elm
IBS Symptoms: Combination Formula Evidence Only, No Placebo Control
No trial has tested slippery elm alone; traditional oral use is 2 to 4 g powdered inner bark in water 3 to 4 times daily, or 400 to 500 mg capsules 3 times daily.
Preliminary
BioEcolians® (Alpha-Glucan Oligosaccharide — Solabia)
Prebiotic fiber that feeds gut bifidobacteria in lab fermentation
8 g/day for eight weeks in the only human study, taken alongside a probiotic; no dose has been shown to work when taken on its own.
Preliminary
ColostrumOne™ (Bovine Colostrum — PanTheryx)
Intestinal barrier support, from colostrum as a class
500 mg to 1 g per serving
Preliminary
Fructan Hydrolase (FODMAP-Targeted)
Breaks down fructans in laboratory digestion models
FODZYME®-style products: 1 sprinkle per serving with FODMAP-containing meals (label-directed use); no dose has been established in a human trial.
Preliminary
NatureKnit® (whole-food fruit & vegetable prebiotic fiber — FutureCeuticals)
Supports a gentle, sustained prebiotic effect
In vitro M-SHIME at ~3.3 g/L product (1.67 g fiber/L); ~2 g typical serving
Limited
FenuLife® (Fenugreek Galactomannan Fiber — IFF)
Occasional heartburn comfort
Products typically supply a few grams of fenugreek galactomannan fiber per day with meals. No FenuLife-specific dose-finding trial; the pooled doses were whole-seed preparations.
Limited
Fucoidan (Brown Seaweed Polysaccharide)
Bowel regularity and gut bacteria balance
300 mg/day (vaccine trial); 500 mg to 1 g/day (blood sugar, urinary symptom and
Limited
Gastro-AD® (Fermented Soy Postbiotic — Lallemand)
Occasional heartburn severity and frequency
Per the product specification.
Limited
N-Acetylglucosamine (NAG)
Glycosaminoglycan substrate for the gut barrier
500-1,500 mg/day in joint studies; 3-6 g/day in the bowel disease pilot
Limited
Pancrelipase / Pancreatin
Post-meal bloating and fullness after a high-fat meal in healthy volunteers
OTC pancreatin capsules are labelled at roughly 5,000 to 10,000 USP lipase units each; trials used prescription dosing of 25,000 to 80,000 lipase units per meal under medical supervision.
Limited
Quince Fruit (Cydonia oblonga)
Digestive symptom scores alongside a prescribed acid reducer
Quince syrup: 1 tablespoon three times daily for 1 week in early pregnancy; 0.6
Limited
Sea Buckthorn (Hippophae rhamnoides)
Bowel movement frequency
Oil: 2 g/day (eye trial), 3 g/day (vaginal trial), 5 g/day (skin and platelet trials).
Limited
Sterculia (Karaya Gum)
Regularity and Colonic Transit Time
ADULT STANDARD: 7-14 g/day (1-2 sachets granules) once or BID with ≥250 mL water. Sri
Preliminary
Amylase
Starch digestion
No cited trial establishes a dose of supplemental amylase for healthy people. Blend labels commonly list 5,000 to 25,000 DU per meal, a typical label amount rather than a tested dose.
Preliminary
DigeSEB® (Digestive Enzyme Blend — Deerland)
Complete-meal digestion
Taken with meals as directed, typically one serving per meal.
Preliminary
Glucoamylase (Amyloglucosidase / γ-Amylase)
CSID starch digestion
No human trial has established a dose; digestive blends usually declare glucoamylase in activity units (AGU) and take it with meals.
Preliminary
Morinaga BB536 (Bifidobacterium longum BB536)
Gut bacteria measures: no change found
46 billion CFU per day for 4 weeks in the single cited trial, which did not show a significant benefit over placebo. Typical labels list 1 to 5 billion CFU per day, far below the amount tested.
Preliminary
Optiziome® Fructanase® (Fructan-Digesting Enzyme — BIO-CAT)
FODMAP digestive support (fructan-specific)
Per BIO-CAT Fructanase product specification
Moderate
Cinaran® (Artichoke Leaf Extract)
Digestive comfort
Commonly 600 mg to 1.8 g of extract per day.
Limited
Betaine HCl / Pepsin
Short-term stomach acid support for digestion
Highly variable, typically 1–3 capsules with high-protein meals; clinical 'titration'
Limited
Fenumannan® (Fenugreek Galactomannan Fiber)
Occasional heartburn (studied with FenuLife, not Fenumannan)
An acute satiety trial used 4 g and 8 g of isolated fenugreek fiber, with 8 g working
Limited
Wheatgrass (Young Wheat Leaf)
Gut lining support: one small trial in ulcerative colitis
Fresh juice 60-100 mL/day; tablets of dried powder, 12/day of unstated strength, in
Preliminary
Bio-Zyme® (Digestive Enzyme Complex)
Digestive support
Taken with meals; dose varies by product. No dose of this blend has been tested in a published clinical trial. Enzyme units differ between brands, so milligram amounts are not comparable.
Preliminary
Biootic® (Probiotic Cultures)
Digestive support
Commonly billions of CFU per day, depending on the strain.
Preliminary
Brewster Probiotics™ (Probiotic Cultures)
Digestive support
Varies by strain and product; commonly billions of CFU per day.
Preliminary
Champex® (Champignon Mushroom Extract — Agaricus bisporus)
Gut environment support
Commonly around 200 to 400 mg per day.
Preliminary
DAOgest® (Porcine Kidney Diamine Oxidase - Bioiberica)
Breaks down histamine from food in the gut
Taken just before histamine-containing meals; consumer products supply roughly
Preliminary
Digesten® (Digestive Enzyme Blend)
Digestive support
Taken with meals; dose varies by product and no dose of this blend has been studied. The cited trials used prescription-strength pancrelipase far beyond what a consumer enzyme capsule provides.
Preliminary
Gevalin® (Bael Fruit for Digestive Health — Zeus Hygia)
Occasional acidity and stomach comfort
Around 250 mg per day.
Preliminary
Lysozyme (Salivary Antimicrobial Enzyme)
Gut barrier and diarrhea studied with lactoferrin in young children
Toothpaste twice daily or lozenge one tablet three times daily, both mouth-only routes
Preliminary
Rējen™ (Fulvic and Humic Acid Trace Minerals — Compound Solutions)
Gut health, energy and metabolism (maker's stated uses)
Not established: Compound Solutions publishes no serving size, and no human study of
Preliminary
Diamine Oxidase (Vegan, Pea-Sprout Derived)
Plant-based way to break down food histamine in the gut
About 1,000,000 HDU (typically one tablet) taken 15-30 minutes before histamine-rich