Gut Health & Digestion Supplements Guide

Live Microorganisms

Probiotics are live beneficial bacteria that support gut health, immunity, and mood through the gut-brain axis. A 2018 meta-analysis found significant IBS symptom reduction with multi-strain probiotics. Benefits are strain-specific — choose based on your health goal. Typical dose: 10-50 billion CFU daily. Look for third-party tested products with verified potency through the expiration date.

Probiotic

Lactobacillus probiotics are among the most researched beneficial bacteria. L. rhamnosus GG prevents antibiotic-associated diarrhea (NNT=7), L. plantarum 299v reduces IBS symptoms, and L. reuteri helps infantile colic. Typical doses are 1-20 billion CFU/day, but strain selection matters more than total CFU count.

Probiotic

Bifidobacterium probiotics support gut health, immune function, and may reduce stress via the gut-brain axis. B. infantis 35624 is a first-line probiotic for IBS (Whorwell et al., 2006). B. lactis BB-12 is the most documented strain for immune health. Typical doses are 1-10 billion CFU/day.

Probiotic Yeast

S. boulardii is a probiotic yeast that is antibiotic-resistant and supported by clinical research for reducing the risk of antibiotic-associated diarrhea and C. difficile recurrence. A Cochrane review found NNT of 10 for AAD prevention. Standard dose is 250-500mg (5-10 billion CFU) twice daily.

Amino Acid

L-Glutamine is the primary fuel for intestinal cells and supports gut barrier integrity by strengthening tight junctions. Clinical studies show it can reduce intestinal permeability and support recovery from gut damage. For gut health, 5-10g daily in divided doses is the standard recommendation.

Soluble Fiber

Psyllium husk is an FDA-recognized soluble fiber that lowers LDL cholesterol by 5-10%, improves bowel regularity, and helps manage blood sugar. Take 5-10g daily with plenty of water. It is one of the few supplements with an FDA-approved health claim for heart disease risk reduction.

Enzyme Supplement

Digestive enzyme supplements help break down food when natural enzyme production is insufficient. Prescription enzymes (PERT) are essential for pancreatic insufficiency. OTC enzymes may help with bloating, food intolerances (lactase for lactose, alpha-galactosidase for beans), and functional dyspepsia. Take with the first bite of each meal.

Digestive Acid Supplement

Betaine HCl supplements stomach acid for people with hypochlorhydria (low stomach acid), which becomes common after age 60. It supports protein digestion, mineral absorption, and pathogen defense. Typical dose is 325-650mg with protein-containing meals. Not for use with NSAIDs, and contraindicated in those with ulcers or H. pylori.

Prebiotic Fiber

Inulin is a prebiotic fiber from chicory root that selectively feeds beneficial gut bacteria, particularly Bifidobacterium and Akkermansia. Doses of 5-10g daily increase beneficial bacteria counts within 2-3 weeks. Emerging evidence connects inulin fermentation to GLP-1 secretion and improved metabolic markers.

Immune / Gut Support

Bovine colostrum provides concentrated immunoglobulins and growth factors that strengthen the gut barrier and support immune defense. Studies show it reduces NSAID-induced intestinal permeability and exercise-induced gut damage. Typical dose is 500mg-10g daily. Well-tolerated but avoid with dairy allergy.

Herbal Demulcent

Slippery elm bark contains mucilage that coats and soothes the GI lining, providing symptomatic relief for heartburn, IBD, and throat irritation. While clinical trial evidence is limited, its long history of traditional use and FDA demulcent recognition support safety. Typical dose is 400-1,000mg capsules or bark tea 3x daily.

Herbal Demulcent

Marshmallow root contains up to 35% mucilage that coats and soothes the GI tract, providing relief for heartburn, gastritis, and throat irritation. It has anti-inflammatory properties beyond its demulcent action. Typical dose is 500-1,500mg capsules or cold-water infusion 3x daily.

Herbal Antispasmodic

Enteric-coated peppermint oil is the best-evidenced herbal treatment for IBS. A 2019 meta-analysis (12 RCTs, n=835) found it significantly reduces IBS symptoms with NNT of 3. Standard dose is 180-200mg enteric-coated capsules 2-3x daily before meals. Must use enteric-coated form to avoid heartburn.

Herbal Gastroprotectant

DGL licorice is a safe form of licorice with glycyrrhizin removed to prevent blood pressure side effects. It protects the stomach lining by stimulating mucus production and enhancing mucosal blood flow. Chew 380-760mg DGL tablets 20 minutes before meals for heartburn, gastritis, or ulcer support.

Postbiotic / Short-Chain Fatty Acid

Tributyrin is a next-generation butyrate supplement that delivers butyrate directly to the colon, bypassing stomach degradation. Clinical research shows butyrate strengthens the gut barrier, reduces intestinal inflammation, and supports beneficial bacteria. Standard dosing is 300-1000mg tributyrin daily with meals.