Best Supplements for Digestion & Gut Health

The credible mechanisms for gut-targeted supplements: replacing or supporting beneficial bacteria after antibiotics (specific probiotic strains for specific conditions); providing fermentable fibre for the existing microbiome to thrive on (psyllium, partially hydrolysed guar gum, inulin); supplementing digestive enzymes when endogenous output is insufficient (lactase, pancreatic enzymes); and reducing localised inflammation in conditions like IBD (curcumin, omega-3 as adjuncts).

• Probiotics — strain-specific (S. boulardii for antibiotic-associated diarrhea; Lactobacillus rhamnosus GG for traveller's diarrhea; specific blends for IBS-D vs IBS-C)
• Psyllium husk (5–10 g/day) — for both constipation and diarrhea (paradoxically, fibre helps both)
• L-glutamine (5 g/day) — for intestinal barrier support during recovery
• Digestive enzymes (lactase, pancreatic blends) — for specific food intolerances
• Peppermint oil (enteric-coated, 0.2 mL three times daily) — clinically validated for IBS
• Ginger (250–1,000 mg) — for nausea

The single largest gut-health intervention is fibre intake — most adults consume 10–15 g/day; the recommendation is 25–35 g, primarily from whole foods. Fermented foods (yogurt, kefir, kimchi) provide beneficial bacteria with longer-term sustainability than capsule probiotics. Limit ultra-processed foods, which appear to disrupt microbiome diversity. Stay hydrated. Manage stress — the gut-brain axis is real, and chronic stress flares many GI conditions. Exercise daily.

See a clinician for: blood in stool, unexplained weight loss, severe abdominal pain, persistent change in bowel habits over 3+ weeks, family history of colon cancer with new GI symptoms, or any GI symptom in someone over 50 who hasn't had a baseline colonoscopy. Iron deficiency in adults is often the first sign of an undiagnosed GI bleed. Don't self-treat persistent GI symptoms with supplements — they can mask diagnosable conditions.