Colon

Nutrients connected to Colon

A link means the body needs the nutrient for this, or that low intake is linked to it. It does not mean extra supplements help if your intake is already adequate; each link shows how strong the evidence is.

• SennaClinically supported

  The laxative compounds act mainly on the bowel; long use may discolour the bowel lining (usually reversible).

• Rhubarb rootClinically supported

  The laxative action is on the bowel. Long-term use can discolour the colon lining, which usually returns to normal after stopping.

• Prebiotic fibresLab or animal research only

  Undigested fibre is fermented by bacteria in the large bowel. Fermentation markers such as lower stool pH are seen, but clinical benefit is not established.

• Inulin and chicory root fibreDocumented risk

  In adults with IBS an inulin drink increased colonic volume and gas, and more of them reached a symptom threshold than after glucose; the authors point to colon sensitivity to stretching.

• Fibre supplements (psyllium, methylcellulose, calcium polycarbophil and others)Clinically supported

  The bulk-forming effect shows up as softer, more frequent stool in the colon; psyllium evidence.

• PsylliumClinically supported

  Eases constipation and keeps stool soft; the EU lists haemorrhoid and fissure uses.

• KiwifruitPreliminary or mixed

  Studied for constipation; the evidence is low certainty.

• PlumsClinically supported

  Prunes (dried plums) eased mild to moderate constipation in trials; a guideline rates most diet evidence low certainty. Results are for dried plums, not fresh.

• Prunes (Dried Plums)Clinically supported

  The studied effect is on stool frequency and consistency; it works through fiber and sorbitol in the bowel.

• Senna Tea (Laxative Teas)Documented risk

  Chronic use is linked to colon pigment change (melanosis coli) in a case report and in the EU monograph.

• Chicory rootPreliminary or mixed

  The fiber is fermented by bacteria in the large bowel, and stools became softer and more frequent in trials.

• Sarpagandha (Indian snakeroot)Documented risk

  The label lists ulcerative colitis as a contraindication.

• Kutaja (kurchi)Preliminary or mixed

  A 30-person trial in chronic ulcerative colitis compared a single-herb tablet with mesalamine; too small to show benefit.

• WheatgrassPreliminary or mixed

  Used for active ulcerative colitis symptoms; one small one-month trial was positive and a 2013 review called the studies limited.

• YaconPreliminary or mixed

  Fermentation of fructooligosaccharides occurs in the large bowel; only stool outcomes were studied in the sources read.

• DatesLab or animal research only

  Lab tests on stool samples from 22 people showed lower stool ammonia and genotoxicity; no disease outcome was measured.

• FigsPreliminary or mixed

  Fig paste was reported to shorten gut transit time in a narrative review; limited evidence.

• Globe ArtichokesPreliminary or mixed

  Fermentable fiber is used by bacteria in the large bowel; this is shown for isolated inulin, not the vegetable.

• Burdock Root TeaPreliminary or mixed

  The diverticulitis trial concerned the colon; single open-label trial.

• PopcornPreliminary or mixed

  The 2026 ACG diverticulitis guideline abstract advises a healthy diet without avoiding corn or popcorn.

• Decaf CoffeePreliminary or mixed

  One cohort found a lower colorectal cancer risk per cup of decaf; observational.

• Prune JuicePreliminary or mixed

  Constipation trials measured stool form and frequency; one trial of prune juice found fewer hard stools.

• CarrageenanLab or animal research only

  Colon lesions and tumors were seen in rats and monkeys given degraded carrageenan; EFSA says this relates mainly to the degraded form.

• Castor OilPreliminary or mixed

  Used as a laxative and in clinician-directed bowel preparation before colonoscopy (retrospective study).

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