There is pre-existing evidence that probiotics could be useful in the improvement of ileus rates. One metaanalysis of 30 studies demonstrated a reduction in the prevalence of post-operative ileus as determined by time to flatus, time to defecation, as well as postoperative abdominal distension (PMID:37373843). More broadly in gastrointestinal surgery, a meta-analysis of 21 randomised controlled trials similarly affirmed the speedier recovery of gastrointestinal function after surgery when probiotics were administered (PMID: 35231076). In spite of these advantages, the routine use of probiotics perioperatively for colorectal cancer surgery is not performed in Singapore. We therefore seek to perform a trial to investigate whether probiotic administration perioperatively may reduce post operative ileus rates.

Inclusion Criteria:

1. undergoing elective colorectal cancer surgery in which an oncologic resection is planned
2. age between 21 and 99 years at the time of consent
3. willing to consider oral nutritional supplementation
4. on an early recovery after surgery (ERAS) pathway
5. able to provide informed consent

Exclusion Criteria:

1. patients with known contraindications to probiotic use
2. patients undergoing emergency surgery
3. taking any other form of probiotics
4. taking oral antibiotics within 7 days of commencement of study
5. vulnerable patients including pregnant patients, inmates, and those who are cognitively impaired and therefore are not able to provide informed consent.

Individual participant data will not be shared.