A total of 238 participants who have undergone radical resection for colorectal cancer and are scheduled to initiate adjuvant chemotherapy will be enrolled and randomly assigned in a 1:1 ratio to the intervention group or the control group. During adjuvant chemotherapy, participants in the intervention group will receive Clostridium butyricum capsules, while those in the control group will receive a placebo. The primary outcome is the incidence of CTCAE grade 3-4 diarrhea during adjuvant chemotherapy.
