Inclusion Criteria:  Having IBS symptomatology meeting the Rome IV criteria; Having a IBS-SSS score ≥150 ; In a state of general and mental health compatible with participation in the study ; Agreeing to maintain their lifestyle during the study (same dietary and physical activity habits) ; Willing to take stool samples; Able and willing to participate in the research by complying with the protocol procedures, especially regarding the consumption of the study product; Having electronic tools (computer, tablet...) and an internet connection, allowing him/her to fill out the self-questionnaires of the study online; Affiliated to a social security system.  Exclusion Criteria:  Have a history of hypersensitivity to any of the ingredients of the study product; Under antibiotic treatment, or having stopped it for less than 14 days; Under dietary supplementation (prebiotics or probiotics) or having stopped it for less than one month; Having initiated or modified a background treatment for a comorbidity for less than one month, or planning to initiate it during the study, or planning to interrupt it during the study; Having a lifestyle incompatible with the study as determined by the investigator; Women who are pregnant or breastfeeding or who intend to become pregnant within the next 2 months; Planning to travel extensively during the study period or unable to be contacted in case of emergency; Psychologically or linguistically unable to understand and sign the informed consent; Participating in another clinical trial or on an exclusion period from a previous clinical trial; Under legal protection (guardianship, curatorship) or deprived of their rights following an administrative or judicial decision.