Inulin vs Psyllium Husk
How inulin and psyllium husk differ in how they work, evidence, tolerance, and cost.
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Side by Side
| Inulin | Psyllium Husk | |
|---|---|---|
| How it works | Soluble, non-viscous fructan rapidly fermented by colonic bacteria, selectively increasing bifidobacteria and producing short-chain fatty acids. | Soluble, gel-forming, minimally fermented. The gel holds water to soften hard stool and firms loose stool, and traps bile acids, which lowers LDL cholesterol. |
| Typical dose | 5-10 g daily, increased gradually | 5-10 g powder 1-3 times daily with ample water |
| Common uses | prebiotic, fiber fortification of foods | constipation, diarrhea and IBS, LDL cholesterol lowering, glycemic control |
| Side effects | Gas and bloating, especially above 10 g; a high-FODMAP fiber that commonly worsens IBS symptoms. | Bloating at first; must be taken with enough water. Separate from medications by at least 2 hours. |
| Cost | Low | Low |
| Also called | chicory root fiber, fructooligosaccharides (short-chain) | ispaghula, Plantago ovata |
When to Choose Inulin
Choose inulin when the goal is a prebiotic effect and you tolerate fermentation. Non-viscous, so it does not provide the stool-normalizing or LDL-lowering effects of gel-forming fibers.
Inulin
Choose inulin when the goal is a prebiotic effect and you tolerate fermentation.
What to look for: Inulin named on the Supplement Facts panel, with the amount per serving stated.
Find on iHerb Affiliate linkWhen to Choose Psyllium Husk
Choose psyllium husk when you want stool normalization or cholesterol lowering with the strongest evidence. Carries an FDA-authorized health claim for coronary heart disease risk reduction. Little gas because it resists fermentation.
Psyllium Husk
The most studied supplemental fiber. It lowers LDL and normalizes stool in both directions, and it improves glycemic control in proportion to how poor that control is.
What to look for: Plain psyllium husk or powder with grams of psyllium per serving, sugar-free for daily use. Start at 3-5 g.
Find on iHerb Affiliate linkProducts on Titrate
2,168 of the 214,745 labels in the NIH Dietary Supplement Label Database list fiber as an active ingredient (1,232 on market). 322 are sold as fiber products by name.
Fiber does not have its own search category yet. Each product above links to its full label in the NIH database.
Related
References
Institute of Medicine. National Academies Press, 2005. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids.
Moayyedi P, et al. The effect of fiber supplementation on irritable bowel syndrome: a systematic review and meta-analysis. Am J Gastroenterol. 2014;109(9):1367-1374.
Gibb RD, et al. Psyllium fiber improves glycemic control proportional to loss of glycemic control: a meta-analysis of data in euglycemic subjects, patients at risk of type 2 diabetes mellitus, and patients being treated for type 2 diabetes mellitus. Am J Clin Nutr. 2015;102(6):1604-1614.
McRorie JW Jr, McKeown NM. Understanding the Physics of Functional Fibers in the Gastrointestinal Tract: An Evidence-Based Approach to Resolving Enduring Misconceptions about Insoluble and Soluble Fiber. J Acad Nutr Diet. 2017;117(2):251-264.
Jovanovski E, et al. Effect of psyllium (Plantago ovata) fiber on LDL cholesterol and alternative lipid targets, non-HDL cholesterol and apolipoprotein B: a systematic review and meta-analysis of randomized controlled trials. Am J Clin Nutr. 2018;108(5):922-932.
McDonald D, et al. American Gut: an Open Platform for Citizen Science Microbiome Research. mSystems. 2018;3(3):e00031-18.
Reynolds A, et al. Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. Lancet. 2019;393(10170):434-445.
Wastyk HC, et al. Gut-microbiota-targeted diets modulate human immune status. Cell. 2021;184(16):4137-4153.