The following probiotics have been well studied and shown to be useful for people with IBS and/or SIBO. Megaspore: a spore-based probiotic containing very hardy strains that can survive the stomach acid and arrive intact in the small intestine. Saccharomyces boulardii: a yeast-based probiotic that is ideal for people with SIBO, IBS, immune deficiency, travelers’ diarrhea, and more. Jarrow Formulas Ideal Bowel Support 229v: ideal for people with IBS, abdominal pain, and bloating. Visbiome: for people with IBS symptoms, IBD, and other more severe intestinal dysbiosis. Metagenics UltraFlora Acute
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