A Dietary Supplement (Resistant Potato Starch) for Reducing Musculoskeletal Symptoms in Individuals Planning to Receive Aromatase Inhibitor Therapy, AIMSS-RPS Trial

Inclusion Criteria: * Patient who is planning to start standard-of-care AI therapy and receive treatment for at least 24 weeks. Can be planning to take AI therapy for stage 0-3 breast cancer or because they are at high risk of developing breast cancer. Concurrent gonadotropin-releasing hormone antagonist (GnRHa) therapy, anti-osteoclast therapy, anti-HER2 therapy, ribociclib, and/or PARP inhibitor are permitted * Average joint pain 0-6 on a 0-10 scale during the 7 days prior to study enrollment * Able to take oral medication * Able to read and understand English * Aware of the nature of her diagnosis, understands study requirement, and able to sign an informed consent form Exclusion Criteria: * Distant metastatic breast cancer * Current or planned use of abemaciclib during study participation * Current or planned use of chemotherapy or immunotherapy during study participation * Pregnant or breast feeding, or planning to become pregnant during study participation * Known active inflammatory bowel disease * History of colectomy and/or gastric bypass * Prior AI therapy except in the context of fertility treatment * Planned use of prebiotics during study participation * Use of estrogen supplementation other than vaginal estrogen * Receipt of another investigational agent concurrent with participation in this trial