Probiotic Research: Open-label Functional Intervention and Longitudinal Evaluation in Healthy Adults

Inclusion Criteria: * Aged 18 years or older at the time of providing informed consent. * In generally good health, with no known medical conditions that could interfere with the aims of the study or participant safety, as judged by self-report and screening questionnaire. * No history of significant psychiatric or neurological illness * Ability to complete study specific tasks, including: * Daily oral intake of a probiotic capsule * Self-collection of stool samples * Completion of online questionnaires and simple cognitive tasks * Able to read, understand, and communicate in English, in order to give informed consent and follow study instructions. * Access to the internet and a suitable device (e.g., smartphone, tablet, or computer) for completing online aspects of the study. Exclusion Criteria: * Participants will be excluded from the study if any of the following criteria apply: * Use of any systemic antibiotic or systemic immunosuppressive medication within the past 8 weeks, including but not limited to: * β-lactam antibiotics, macrolides, tetracyclines, fluoroquinolones, aminoglycosides, glycopeptides, sulfonamides, antimycobacterial agents, systemic antifungals or antivirals * Use of any systemic immunosuppressants within the past 16 weeks, including, but not limited to: * Systemic corticosteroids, conventional immunosuppressants, biologic immunomodulators, targeted synthetic immunosuppressants, cytotoxic chemotherapy, or transplant-related immunosuppression. * A lon…