Inclusion Criteria:  Postmenopausal (more than 5 years since last menstruation) Read and understand Danish  Exclusion Criteria:  Participants receive treatment with estrogen both oral, transdermal, and topical within three months prior to inclusion in the study Participants take estrogen-like compounds (isoflavones) three months prior to inclusion in the study Participants take prebiotic and/or probiotic supplements within three months prior to study inclusion Receive antibiotics (any) within three months prior to inclusion in the study Recurrent urinary tract infections (defined as ≥ 2 infections in the last six months or ≥ 3 infections during the last year) Acute urinary tract infection defined as positive urine culture and symptoms of acute cystitis Previous or current diseases of the digestive and/or urinary systems evaluated by PI (including, but not limited to inflammatory bowel disease (IBD) and cancer) Current or prior suffering from breast, ovary, and/or endometrial cancer Use hormone spiral within the last 5 years if they are under 60 years Hysterectomy before cessation of menstrual periods if the women are below the age of 60