The goal of this randomized crossover clinical trial is to evaluate the efficacy of Clostridium butyricum MIYAIRI 588 (CBM588) in reducing colorectal adenomatous polyp recurrence in adult patients with a history of colorectal polyps. The main questions it aims to answer are: * Does CBM588 reduce the recurrence of colorectal adenomatous polyps? * Does CBM588 lead to a sustained decrease in polyp burden over time? Researchers will compare a group receiving CBM588 in the first year to a group receiving CBM588 in the second year (after a washout period) to determine whether CBM588 effectively lowers polyp recurrence rates and adenoma prevalence.
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Colorectal polyp recurrence rate (%)
Timeframe: 1 year and 2.25 years after baseline colonoscopy