Probiotics for Depressive Symptomatology and Neural Activity.

Inclusion Criteria: * Mild to moderate depression symptoms (BDI-II 12-28) * Males and females * Age range will be 25-40 years * Right-handed participants only (required for EEG) Exclusion Criteria: * Taking antidepressants (up to 2 months prior to inclusion) * Undergoing psychological treatment in the form of counselling, therapy or similar (up to 1 month prior to inclusion) * Any diagnosed chronic medical condition (e.g. diabetes) or psychiatric illness. * Use of antibiotics or laxatives (up to 3 months prior to inclusion) * Use of probiotics and/or prebiotics (up to 1 month prior to inclusion) * Enrolled in any other clinical trial (up to 1 month prior to inclusion) * Following restrictive and/or unbalanced diets * Smoking * Continuous use of a weight-loss medication for more than one month prior to screening * Significant gastrointestinal conditions affecting absorption, including but not limited to: inflammatory bowel disease; total colectomy or bariatric surgery; irritable bowel disease; end-stage renal disease; active cancer or cancer treatment within the past three years