“I think it’s essential that people keep signing up to these type of trials to push research forward.”
A study looking at curcumin to help prevent bowel cancer or stop it coming back
This study looked at the possibility of giving curcumin capsules to people with bowel cancer or bowel polyps to help prevent bowel cancer developing, or coming back after surgery. This study was supported by Cancer Research UK.
Bowel cancer is one of the most common cancers in the UK. Curcumin is a natural substance found in the spice turmeric, a spice used in curries. Cultures that use a lot of turmeric in their cooking seem to have a low amount of bowel cancer in the population. The curcumin in turmeric may be one reason for this.
Doctors are always looking for ways to stop bowel cancer developing, or coming back after surgery and they thought curcumin may help. In this study, researchers gave curcumin capsules to people who had a test to look for bowel polyps or had surgery to remove bowel cancer. The aims of the study were to find out
- How much curcumin was absorbed by the body
- If taking 5 capsules of curcumin a day was acceptable to people
Summary of results
The study team found that curcumin was safe to take and that most people would accept taking 5 capsules a day.
This was a pilot study. It recruited 26 people who either had a test (colonoscopy or sigmoidoscopy) to look for bowel polyps or surgery to remove bowel cancer. Everyone was to have 5 capsules (½ teaspoon) of curcumin daily for 2 weeks.
Of the 26 people, 24 completed the 2 weeks of curcumin. The study team took samples of their urine and blood to look for curcumin. They found it in all of the 24 urine samples and 9 of the blood samples.
23 of these 24 people also had tissue samples (
The most common side effects reported were
- Wind (flatulence)
- Tummy (abdominal) pain
After completing the curcumin, 3 people said that 5 capsules may be too many to take and 4 said the size of the capsules could be a problem. 16 said they would continue taking them long term if they proved helpful.
The study team concluded that curcumin at the dose used in this study, about ½ teaspoon, was safe and acceptable.
We have based this summary on information from the team who ran the trial. The information they sent us has been reviewed by independent specialists (
How to join a clinical trial
Prof William Steward
Cancer Research UK
Experimental Cancer Medicine Centre (ECMC)
National Institute for Health Research Cancer Research Network (NCRN)
St Mark's Hospital
University Hospitals of Leicester NHS Trust
This is Cancer Research UK trial number CRUK/07/034.