RecruitingEarly Phase 1Biological interventionOral 5 Strain Probiotic for GI Toxicity Mitigation During Pelvic RadiationThis research is to determine if an oral probiotic, Pendulum Glucose Control (PGC), can be safely given to patients during pelvic radiation therapy (RT). The researchers will study if the probiotics lessen gastrointestinal toxicity during pelvic radiation.