Inclusion Criteria:  Having at least 2 symptomatic episodes of cystitis during the last 6 months including at least 1 episode confirmed as being bacterial cystitis (by an urine bacterial analysis or validated by a doctor (date of appointment, list of prescribed treatments) ; Whose symptomatic episodes of cystitis over the past 6 months have had a significant impact on quality of life / urinary comfort (ACSS QoL> 2); Having a smartphone compatible with the NURSTRIAL® data collection application; Not opposing the collection and processing of their personal data.  Exclusion Criteria:  Presenting urinary discomfort with a severe impact on quality of life (ACSS QoL> 7) during the last 24 hours prior to inclusion; Pregnant, breastfeeding or planning to become pregnant during the study; Under antibiotic treatment (or during the last month preceding inclusion); Under food supplementation with prebiotics or probiotics or having stopped it less than a month before inclusion; Having had recourse to a prophylactic treatment (cranberry juice) 15 days before inclusion; Having had local estrogen therapy during the 3 months preceding inclusion; Diabetic; Presenting an immunosuppressive disease; Presenting pelvic floor abnormalities (Cystocele surgery, etc.); Presenting or having a history of kidney disease (including kidney stones, urinary tract abnormalities, pyelonephritis, kidney failure, kidney transplantation); For women consuming supplementation: known allergy to plants of the cranberry family or to one of the components of the products.