Spice and tea combo tested for stomach troubles

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Participant has provided written informed consent before participating in the study after being given a full description of the study and prior to any study-specific procedures being performed. 2. Participant has irritable bowel syndrome with diarrhoea (IBS-D), as defined by the Rome IV criteria. 3. Participant has an IBS-SSS score of \>175 at screening. 4. Participant is a male or non-pregnant female and is ≥18 years of age 5. Participant can communicate well with the Investigator and to comply with the requirements for the entire study. 6. Participant has capacity to understand written English. 7. Participant has a body mass index (BMI) of 18.5 - 39.9kg/m2 (bounds included). 8. Participant agrees to follow all pre-test preparation before breath testing visits. Exclusion Criteria: 1. Prior abdominal surgery other than appendectomy and cholecystectomy. 2. Known hypercalcaemia. 3. Participating in another trial or taken an IMP within the last 1 month. 4. Females who report to be pregnant or lactating 5. Unwilling to maintain stable doses of permitted concomitant medication 6. Unwilling to maintain a stable diet for the duration of the trial 7. Being in the opinion of the investigator unsuitable 8. Insufficient knowledge of English to complete the daily bowel diary and food diary 9. Hypersensitivity to any component of the supplement 10. Hypersensitivity or known allergy to lactulose 11. Drug interactions with any component of the supplement 12. Consumption of antibiotics, prebiotics or probiotics (in food products or as supplements) in the last 4 weeks prior to, or during the study. 13. Vitamin D two week washout 14. Participants who have received bowel preparation for investigative procedures in the 4 weeks prior to the study 15. Individuals declaring additional specific dietary needs 16. Inflammatory bowel disease or coeliac disease 17. Any other condition, deemed by the investigator, that may be causing their symptoms 18. No major co-morbidity. 19. Participant is involved in this study as an Investigator, sub-Investigator, study coordinator, other study staff, or Sponsor member.