BioAmicus Complete for Functional Gastrointestinal Symptoms in Infants Aged 0 to 24 Months

caregiver burden and health care visits. Modulating the developing gut microbiome with probiotics may alleviate these symptoms. BioAmicus Complete is a multistrain probiotic designed to support a healthy intestinal microbiota; systematic clinical evaluation is warranted to determine its efficacy and safety in infants.

Objectives:

Primary: Determine whether BioAmicus Complete improves overall gastrointestinal symptoms versus usual care, measured by change in IGSQ total score between baseline and study end.

Exploratory (microbiome): Characterize changes in stool microbiome composition and diversity across the study period.

Secondary: Compare groups on symptom domain scores (e.g., colic, regurgitation, stooling patterns), caregiver burden/quality of life, health care utilization and antibiotic exposure, growth parameters, and safety outcomes (adverse events, serious adverse events, and product-related events).

Significance: Findings will inform whether BioAmicus Complete can be recommended as an adjunct to routine care for infant functional gastrointestinal symptoms and will provide preliminary insights into microbiome changes associated with symptom improvement.

Inclusion criteria

• Age 0-24 months at enrollment.
• Infant has clinician-assessed functional gastrointestinal symptoms (e.g., colic/irritability, regurgitation, constipation, loose stools), judged suitable for study participation.
• Parent or legal guardian provides written informed consent and agrees to comply with study procedures (questionnaires/diaries and sample collection, if applicable).
• Caregivers agree to avoid other probiotic products during the study period, except as directed by the study team.

Exclusion criteria

• Major congenital gastrointestinal anomalies or known chronic gastrointestinal diseases requiring ongoing prescription therapy (e.g., Hirschsprung disease, inflammatory bowel disease, short-bowel syndrome).
• Clinically unstable condition or severe/critical illness that could interfere with participation or safety in the opinion of the investigator.
• Known or suspected primary or secondary immunodeficiency, or current immunosuppressive therapy.
• History of severe allergy or hypersensitivity to components of the investigational product.
• Recent use of systemic antibiotics within 14 days prior to baseline, or use of probiotic supplements within 14 days prior to baseline (per protocol).
• Participation in another interventional clinical trial within 30 days prior to enrollment or during the study.
• Any condition that, in the investigator's judgment, would make the participant unsuitable for the study or confound outcome assessments.