Inulin vs Partially Hydrolyzed Guar Gum
How inulin and partially hydrolyzed guar gum differ in how they work, evidence, tolerance, and cost.
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Side by Side
| Inulin | Partially Hydrolyzed Guar Gum | |
|---|---|---|
| How it works | Soluble, non-viscous fructan rapidly fermented by colonic bacteria, selectively increasing bifidobacteria and producing short-chain fatty acids. | Guar gum enzymatically shortened to reduce viscosity. Fermented slowly, which limits gas. |
| Typical dose | 5-10 g daily, increased gradually | 5-6 g daily |
| Common uses | prebiotic, fiber fortification of foods | IBS, gentle prebiotic, enteral nutrition |
| Side effects | Gas and bloating, especially above 10 g; a high-FODMAP fiber that commonly worsens IBS symptoms. | Generally well tolerated; low-FODMAP certified products exist. |
| Cost | Low | Moderate |
| Also called | chicory root fiber, fructooligosaccharides (short-chain) | PHGG, Sunfiber |
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 Partially Hydrolyzed Guar Gum
Choose partially hydrolyzed guar gum when you have IBS and want a fermentable fiber with less gas. Often the best-tolerated fermentable fiber for IBS.
Partially Hydrolyzed Guar Gum
Fermentable but slow, so it produces less gas than inulin. Small IBS trials favor it.
What to look for: Sunfiber is the most studied ingredient. About 5-6 g a day.
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.