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Psyllium Husk (Soluble Fibre) for IBS-C

Reviewed by the Nimbera editorial team · Last updated May 2026

A double-blind RCT by Shulman et al. (Clin Gastroenterol Hepatol, 2017; n=103) found psyllium supplementation reduced mean abdominal pain episodes significantly more than placebo (8.2 vs 4.1 reduction, p=0.03) in patients with IBS.$10-$20 for a 1-2 month supply

How to use

Start with 5 g (approximately 1 teaspoon) of psyllium husk powder mixed into 240 ml of water or juice once daily. Gradually increase over 2-4 weeks to 10-15 g/day in divided doses (e.g., 5 g before breakfast and 5 g before dinner) to minimise initial bloating. Always drink a full glass of water with each dose. Take separately from medications by at least 2 hours.

How it works

Psyllium is a soluble, gel-forming fibre that absorbs water in the colon, softening stool and reducing straining for IBS-C. It also slows intestinal transit in IBS-D, normalises stool consistency, and acts as a prebiotic to support healthy gut bacteria.

Where to buy

Metamucil (original or sugar-free), Konsyl Organic Psyllium, NOW Psyllium Husk - available at Walmart, Target, CVS, and health food stores. Buy plain psyllium husk powder rather than flavoured products to avoid added sugars that may worsen symptoms.

Typical cost: $10-$20 for a 1-2 month supply

Safety notes

Must be taken with adequate water - taking without sufficient fluid can cause choking or intestinal blockage. Can cause initial gas and bloating as gut bacteria adjust; start low and increase slowly. May reduce absorption of medications (warfarin, diabetes drugs, thyroid medications) if taken simultaneously - separate by 2 hours. Avoid if you have difficulty swallowing or known bowel obstruction.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Shulman et al., Psyllium fibre reduces abdominal pain in children with IBS, Clin Gastroenterol Hepatol, 2017

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.