Effect of a Probiotic Supplement on Gut Microbiota and Glycemic Control in Patients With Type 1 Diabetes (PRODIAB)

Inclusion Criteria: * Age between 18 and 65 years. * Ability to understand and sign the informed consent form. * For the patient group: diagnosis of type 1 diabetes with at least 1 year of disease progression. * For the control group: healthy individuals without a diagnosis of diabetes or other metabolic disorders. * No use of antibiotics, probiotics, or prebiotics during the 4 weeks prior to the study start. * Willingness to comply with the study protocol and attend scheduled visits. Exclusion Criteria: * Current use of probiotics, prebiotics, or antibiotics. * Chronic gastrointestinal diseases (e.g., inflammatory bowel disease, irritable bowel syndrome). * Pregnancy or breastfeeding. * Participation in another clinical trial within the past 3 months. * Immunosuppressive diseases, active cancer, or treatment with immunosuppressants. * Known allergy or intolerance to any component of the supplement or placebo. * Excessive alcohol or drug use.