Key probiotic strains for intestinal health are strain-specific, with Lactobacillus rhamnosus GG and Bifidobacterium lactis leading evidence for diarrhea prevention, IBS relief, and barrier support.
Top evidence-backed strains
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Lactobacillus rhamnosus GG (LGG): Reduces antibiotic diarrhea by 60%+, traveler's diarrhea, and IBS symptoms; survives stomach acid well.
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Bifidobacterium lactis (Bi-07, HN019, BB536): Improves regularity, bloating, and immunity; boosts short-chain fatty acids for gut lining.
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Saccharomyces boulardii: Yeast strain prevents C. difficile and infectious diarrhea; antibiotic-resistant.
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Lactobacillus plantarum 299v: Eases IBS bloating and motility.
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Lactobacillus reuteri DSM 17938: Aids constipation and gut barrier.
Aim for 10-50 billion CFUs with live cultures; multi-strain blends work best for general health.
How they support intestines
These colonize the gut, crowd out pathogens, strengthen mucosa, modulate immunity, and ferment fiber into anti-inflammatory compounds.nutritionsource.
Benefits strongest post-antibiotics, during travel, or IBS; food sources like yogurt add value.
Match strain to need; refrigerated storage key.
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