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Partially hydrolyzed guar gum
Soluble fibre · IBS · Prebiotic
Tier 3 — Trending
What it is
Acid-hydrolysed galactomannan from guar bean. Unlike whole guar (which is too viscous and causes gut blockages historically), the partial-hydrolysate form is well tolerated and has small-RCT evidence in IBS-C, IBS-D, and functional constipation. Acts as a gentle prebiotic favouring Bifidobacterium and butyrate producers. Preferred over inulin/FOS in patients sensitive to fermentable fibres.
Efficacy
3/5
Safety
4/5
Research
3/5
Onset
3/5
Cost
4/5
Drug-int.
4/5
Dose
5-7 g/day (gradually titrate from 2.5 g)
Time of day & tips
Mix into water; expect 1-2 weeks for stool consistency to normalise; safer for sensitive guts than inulin/FOS.
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