The Gut Restoration Stack: PHGG, L. rhamnosus GG, S. boulardii, and Zinc Carnosine

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The "gut healing" supplement category is dominated by speculative products with no clinical evidence. A defensible restoration stack draws on supplements with strain-specific or trial-grade evidence for the components of gut function: prebiotic fiber to feed Bifidobacterium, two well-studied probiotic strains for antibiotic recovery and immune support, and zinc-carnosine">zinc-carnosine">zinc carnosine for mucosal barrier integrity.

Layer 1: Partially Hydrolysed Guar Gum (PHGG / Sunfiber), 5–10 g Daily

PHGG is the soluble prebiotic fiber with the cleanest IBS and post-antibiotic restoration evidence. Unlike inulin and FOS, PHGG ferments gradually along the entire colon without producing the explosive bloat that high-FODMAP prebiotics cause in sensitive guts. Start at 3 g daily, ramp to 5–10 g over 2 weeks. See PHGG piece.

Layer 2: Lactobacillus rhamnosus GG (LGG), 10¹⁰ CFU Daily

LGG is the most-studied probiotic strain in the world, with positive evidence for prevention of antibiotic-associated diarrhea, atopic dermatitis prevention (with maternal use), and modest IBS-D signal. Use during and 2 weeks after any antibiotic course. See LGG piece.

Layer 3: Saccharomyces boulardii, 5–10 billion CFU Daily

S. boulardii is a yeast (not bacterial) probiotic with strong evidence in C. difficile recurrence prevention and antibiotic-associated diarrhea. Unique mechanistic advantage: not killed by concurrent antibiotics. Use during any broad-spectrum antibiotic course or after C. difficile treatment. See S. boulardii piece.

Layer 4: Zinc Carnosine (Polaprezinc), 75 mg Twice Daily

Zinc carnosine is the form of zinc with the strongest gastric mucosal barrier evidence. Licensed in Japan since 1994 for gastric ulcer therapy. Useful in adults recovering from NSAID-induced gut damage, H. pylori eradication, or chronic gastritis. See zinc carnosine piece.

Layer 5 (Optional): Bifidobacterium infantis 35624 — For IBS Component

If the underlying picture includes IBS pain/bloating (not just antibiotic recovery), add B. infantis 35624 (Align) at 1 billion CFU daily. The strongest strain-level IBS evidence. See B. infantis 35624 piece.

What NOT to Take

Skip "leaky gut healing" multi-ingredient megaformulas — glutamine and quercetin have null trial data for the modal use case. Avoid commercial "intestinal cleanse" protocols entirely — many contain stimulant laxatives and "antiparasitic" herbs of unknown safety. Avoid bone broth as a "gut healing" intervention — collagen amino acids don't reach the colon. Skip kefir or kombucha as a substitute for strain-specific probiotic therapy — wild bacterial profiles are unpredictable. Avoid generic "probiotic megaformula" products with 20+ strains at marketing-only CFU counts.

How to Run the Stack

For antibiotic recovery: S. boulardii during the course + LGG starting day 1 for 2-4 weeks after, then add PHGG. For chronic GI dysbiosis: PHGG + LGG continuous, add S. boulardii during any antibiotic exposure. For NSAID-related gastritis: zinc carnosine 75 mg BID for 4-8 weeks. Re-evaluate symptoms (stool form, bloating, frequency) at 8 weeks. See probiotics + antibiotics timing piece.