From the databaseWhat the row says.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
Scope
Supplement × Supplement
Last verified
June 4, 2026
CautionInsufficient evidence
What is happening. Both are gel-forming fibers and can cause bloating, constipation, or swallowing risk if fluid is inadequate.
Mechanism. Additive viscosity, water-holding, and stool-bulking effects.
Recommendation. Use one demulcent fiber at a time or keep doses low with ample water.
Stack Score
How it moves the number.
Effect on the composite score
If both Psyllium Husk and Slippery Elm are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.
SourcesSources, by evidence tier.
Every claim on this page is cited. PMIDs link straight to PubMed.
Reference material
1- 1Hawrelak JA and Myers SP. Natural medicine formulations in IBS. Journal of Alternative and Complementary Medicine. 2010.Needs sourceNo link