Could a daily probiotic soothe your upset stomach?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age 18-65 years 2. Diagnosis of Functional Dyspepsia based on Rome IV criteria, with symptoms present for at least 3 months, and symptom onset at least 6 months before diagnosis, including: * Postprandial fullness * Early satiation * Epigastric pain or burning * (with no evidence of structural disease explaining symptoms) 3. Moderate to severe symptom severity at baseline, as defined by a validated scale (e.g., NDI or global symptom score) 4. Normal upper GI endoscopy within the last 12 months (or at screening), excluding structural disease (e.g., peptic ulcer, malignancy) 5. Negative for H. pylori (either previously treated successfully or tested negative within study screening) 6. Ability and willingness to provide informed consent and comply with study procedures 7. Stable medication use, if any, for at least 4 weeks before screening (e.g., PPIs, antidepressants, laxatives) Exclusion Criteria: 1. Evidence of structural GI disease (e.g., peptic ulcer, gastric cancer, celiac disease) on recent or screening endoscopy 2. History of gastrointestinal surgery affecting stomach or small intestine (except appendectomy or cholecystectomy) 3. Positive test for H. pylori during screening (or untreated known infection) 4. Current or recent use (within 4 weeks) of antibiotics, pre-, pro- or postbiotics, unless part of study protocol 5. Use of medications affecting GI motility (e.g., prokinetics, opioids, anticholinergics) within 2-4 weeks before enrollment 6. Overlap with other functional GI disorders (except IBS) if they are the dominant complaint, unless your protocol allows overlap 7. Clinically significant psychiatric illness (e.g., major depression, schizophrenia) that may interfere with symptom reporting or adherence 8. Severe systemic or metabolic disease (e.g., uncontrolled diabetes, renal or hepatic failure) 9. Pregnancy or lactation, or intention to become pregnant during the study period 10. Participation in another clinical trial within the past 3 months 11. Known allergy or intolerance to study product components