# Inulin
**Inulin** is a naturally occurring storage polysaccharide, a fructan made of a linear chain of β-2,1-linked d-fructofuranose molecules usually terminated with an α-d-glucose moiety at the reducing end.[1](https://pubmed.ncbi.nlm.nih.gov/30503580/) It functions as a storage carbohydrate in many plant species, is water soluble and non-digestible, and is used widely in the food and pharmaceutical industries as a fat replacer, sugar replacer, texture modifier, and prebiotic dietary fiber.[2](https://pmc.ncbi.nlm.nih.gov/articles/PMC9449745/)
| Key fact | Detail |
|---|---|
| Chemical structure | Linear chain of β-(2→1)-linked β-d-fructosyl residues, n = 2–60, usually with a terminal α-d-glucose unit; the hydrolyzed form oligofructose has n = 2–10[3](https://www.sciencedirect.com/science/article/pii/S0144861715004257) |
| Plant distribution | Present in tubers, bulbs, and tuberous roots of more than 36,000 plants of both monocotyledonous and dicotyledonous families[1](https://pubmed.ncbi.nlm.nih.gov/30503580/) |
| Major sources | Chicory (*Cichorium intybus*), Jerusalem artichoke (*Helianthus tuberosus*), dahlia, asparagus, globe artichoke[1](https://pubmed.ncbi.nlm.nih.gov/30503580/) • [4](https://www.sciencedirect.com/science/article/pii/S0144861725013463) |
| Discovery | First isolated from the roots of *Inula helenium* by Valentine Rose in the early 1800s and named by Thomson in 1817[4](https://www.sciencedirect.com/science/article/pii/S0144861725013463) |
| Food uses | Fat replacer, texture modifier, sugar replacer, bulking agent, and prebiotic fiber; FDA approved inulin as a dietary fiber constituent in 2018[2](https://pmc.ncbi.nlm.nih.gov/articles/PMC9449745/) • [5](https://www.sciencedirect.com/org/science/article/pii/S1574885525000021) |
| Pharmaceutical uses | Diagnostic agent for kidney function and protein stabilizer[3](https://www.sciencedirect.com/science/article/pii/S0144861715004257) |
| Typical trial doses | Human supplementation studies have used 5 to 20 g per day[6](https://pubmed.ncbi.nlm.nih.gov/31707507/) |
## Structure and chain length
Inulin belongs to the fructan group of polysaccharides, carbohydrates composed of fructose and glucose that plants, fungi, and bacteria use and produce; plants are the primary source.[2](https://pmc.ncbi.nlm.nih.gov/articles/PMC9449745/) • [4](https://www.sciencedirect.com/science/article/pii/S0144861725013463) The molecule is a polydisperse mixture of chains of different lengths, mostly β-(2→1) fructosyl-fructose linkages, with or without a terminal glucose unit.[7](https://academic.oup.com/ijfst/article/57/9/5764/7807227) Unlike starch, the most abundant storage polymer of glucose, inulin has fructose as its main monomeric unit.[8](https://iadns.onlinelibrary.wiley.com/doi/10.1002/fft2.92)
Chain length governs behavior. The degree of polymerization (DP) and the processing history of an inulin sample have a large impact on its physicochemical behavior, including solubility, viscosity, gelling, and thermal properties.[3](https://www.sciencedirect.com/science/article/pii/S0144861715004257) The maximum DP of plant inulin depends on plant species, cultivar, physiological age, harvesting time, and extraction, processing, and storage conditions.[7](https://academic.oup.com/ijfst/article/57/9/5764/7807227) Higher molecular weight inulin (inulin HP, DP above 10) has limited solubility and no sweetness, while shorter chains are sweeter and more soluble.[8](https://iadns.onlinelibrary.wiley.com/doi/10.1002/fft2.92) Long-chain inulin contributes mainly gelling and texturizing properties rather than flavor.[9](https://pmc.ncbi.nlm.nih.gov/articles/PMC12564896/) Inulin typically shows a glass transition temperature of 103 to 158 °C, varying with chain polymerization, water activity, and molecular structure.[9](https://pmc.ncbi.nlm.nih.gov/articles/PMC12564896/) Structural identification of these fructans remains difficult because fructose is unstable under thermal and acidic conditions.[4](https://www.sciencedirect.com/science/article/pii/S0144861725013463)
## Plant sources and extraction
Inulin occurs in more than 300 vegetables and is part of the normal human dietary intake.[2](https://pmc.ncbi.nlm.nih.gov/articles/PMC9449745/) Natural food sources include [Jerusalem artichoke](https://www.edgepedia.org/jerusalem-artichoke), wheat, banana, asparagus, garlic, leek, and onion.[2](https://pmc.ncbi.nlm.nih.gov/articles/PMC9449745/) Chicory and Jerusalem artichoke are the principal industrial crops; chicory roots used for inulin and oligofructose production are the same types used for coffee chicory, and extraction uses hot water.[10](https://www.ams.usda.gov/sites/default/files/media/Inulin%20Petition.pdf) Process variables such as temperature, extraction time, pH, and solid-to-liquid ratio significantly affect recovery yield and polymer stability.[9](https://pmc.ncbi.nlm.nih.gov/articles/PMC12564896/)
## Food and pharmaceutical applications
In food systems, inulin serves as a fat replacer, texture modifier, sugar substitute and bulking agent, and dietary fiber supplement.[2](https://pmc.ncbi.nlm.nih.gov/articles/PMC9449745/) • [5](https://www.sciencedirect.com/org/science/article/pii/S1574885525000021) It is also used as a wall material for microencapsulating polyphenols and pigments, where polysaccharide mixtures improve encapsulation solubility, storage stability, and bioaccessibility.[11](https://arxiv.org/abs/2511.07264) In the pharmaceutical arena, inulin is used as a diagnostic agent for kidney function and as a protein stabilizer.[3](https://www.sciencedirect.com/science/article/pii/S0144861715004257) The United States FDA approved inulin in 2018 as a dietary fiber constituent for treated food items.[5](https://www.sciencedirect.com/org/science/article/pii/S1574885525000021)
## Biotechnological uses
Inulin is a potent substrate and inducer for inulinase production, and inulin-rich feedstocks can be converted into fructooligosaccharides and high-fructose syrup.[1](https://pubmed.ncbi.nlm.nih.gov/30503580/) They can also be exploited for other industrial products including acetone, butanol, bioethanol, single cell proteins, single cell oils, 2,3-butanediol, sorbitol, and mannitol.[1](https://pubmed.ncbi.nlm.nih.gov/30503580/)
## Prebiotic and health effects
As a fermentable, non-digestible fiber, inulin reaches the colon intact and is metabolized by gut bacteria. A systematic review of nine human studies, most randomized double-blind placebo-controlled trials, found the most consistent microbiome change was an increase in *Bifidobacterium*, with concordant increases in *Anaerostipes*, *Faecalibacterium*, and *Lactobacillus* and a decrease in *Bacteroides*; supplementation protocols ranged from 5 to 20 g per day.[6](https://pubmed.ncbi.nlm.nih.gov/31707507/) A broader systematic review of clinical trials in healthy adults reported that inulin-type fructans (ITFs) promote abundances of *Bifidobacterium*, *Lactobacillus*, and *Faecalibacterium prausnitzii*, with reported benefits including improved intestinal barrier function, improved laxation, increased insulin sensitivity, decreased triglycerides and improved lipid profile, increased absorption of calcium and magnesium, and increased satiety.[12](https://pmc.ncbi.nlm.nih.gov/articles/PMC8970830/)
**Metabolic outcomes depend on health status.** A GRADE-assessed meta-analysis of 33 randomized controlled trials concluded that ITF supplementation improves glycemic control in prediabetes and type 2 diabetes populations.[13](https://pmc.ncbi.nlm.nih.gov/articles/PMC6896694/) A separate meta-analysis of trials on body weight, blood glucose, and lipid profile found a significant effect only in diabetics, not in healthy, overweight, or hyperlipidemic subjects.[14](https://pubmed.ncbi.nlm.nih.gov/34401107/) A meta-analysis cited in the cardiovascular literature reported ITF effects on LDL cholesterol (weighted mean difference −0.18 mmol/L) and triglycerides (−0.21 mmol/L), while finding little to no effect on blood glucose.[15](https://ajcn.nutrition.org/article/S0002-9165%252823%252966240-9/fulltext) Mechanistically, inulin slows carbohydrate digestion and glucose absorption, and fermentation-derived short-chain fatty acids stimulate intestinal gluconeogenesis, lower hepatic glucose output, and promote GLP-1 secretion, improving insulin release and β-cell function.[9](https://pmc.ncbi.nlm.nih.gov/articles/PMC12564896/)
**Tolerability.** The European Food Safety Authority reported no adverse events in clinical studies following consumption of chicory inulin at 12 to 40 g per day.[16](https://www.fda.gov/media/135211/download)
## Regulatory developments
Regulators continue to expand approved uses. The European Commission authorized inulin-propionate ester as a novel food by Implementing Regulation (EU) 2026/1219 of 9 June 2026, with specifications including total nitrogen below 0.1 g/100 g and total fat below 0.5 g/100 g.[17](https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A32026R1219) Taiwan's FDA issued rules in August 2026 for inulin produced enzymatically from sucrose solution using fructosyltransferase from *Bacillus* sp. strain 217C-11, requiring the label statement "Inulin in this product is enzymatically produced from sucrose".[18](https://www.fda.gov.tw/ENG/lawContent.aspx?cid=16&id=3612)
## References
1. [Biotechnological applications of inulin-rich feedstocks, Bioresource Technology (2018)](https://pubmed.ncbi.nlm.nih.gov/30503580/)
2. [Lignocellulose, dietary fibre, inulin and their potential application in food, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC9449745/)
3. [Inulin, a flexible oligosaccharide I: Review of its physicochemical characteristics, Carbohydrate Polymers (2015)](https://www.sciencedirect.com/science/article/pii/S0144861715004257)
4. [A comprehensive review of inulin-type fructans and their neo-series, Carbohydrate Polymers (2026)](https://www.sciencedirect.com/science/article/pii/S0144861725013463)
5. [Chemistry, Isolation, and Pharmaceutical Applications of Inulin, ScienceDirect](https://www.sciencedirect.com/org/science/article/pii/S1574885525000021)
6. [The effects of inulin on gut microbial composition: a systematic review of evidence from human studies, PubMed (2019)](https://pubmed.ncbi.nlm.nih.gov/31707507/)
7. [Inulin fructans – food applications and alternative plant sources: a review, International Journal of Food Science & Technology (2022)](https://academic.oup.com/ijfst/article/57/9/5764/7807227)
8. [Possible actions of inulin as prebiotic polysaccharide: A review, Food Frontiers (2021)](https://iadns.onlinelibrary.wiley.com/doi/10.1002/fft2.92)
9. [Techno-Functional Properties and Applications of Inulin in Food Systems, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC12564896/)
10. [Chicory Roots and Production, USDA AMS Inulin Petition](https://www.ams.usda.gov/sites/default/files/media/Inulin%20Petition.pdf)
11. [Edible polysaccharides as stabilizers and carriers for the delivery of phenolic compounds and pigments in food formulations, arXiv](https://arxiv.org/abs/2511.07264)
12. [The Prebiotic Potential of Inulin-Type Fructans: A Systematic Review, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC8970830/)
13. [Inulin-type fructans supplementation improves glycemic control for the prediabetes and type 2 diabetes populations, PMC (2019)](https://pmc.ncbi.nlm.nih.gov/articles/PMC6896694/)
14. [Assessing the effects of inulin-type fructan intake on body weight, blood glucose, and lipid profile, PubMed (2021)](https://pubmed.ncbi.nlm.nih.gov/34401107/)
15. [The effects of inulin-type fructans on cardiovascular disease risk factors, American Journal of Clinical Nutrition](https://ajcn.nutrition.org/article/S0002-9165%252823%252966240-9/fulltext)
16. [GRAS Notice 849, Inulin from artichoke, FDA](https://www.fda.gov/media/135211/download)
17. [Commission Implementing Regulation (EU) 2026/1219, EUR-Lex](https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A32026R1219)
18. [Use Restrictions and Labeling Requirements of Inulin Produced by Fructosyltransferase as a Food Ingredient, Taiwan FDA](https://www.fda.gov.tw/ENG/lawContent.aspx?cid=16&id=3612)
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*Topic: Encyclopedia › Life and health › Plants and algae › Seed plants › Other flowering plants › Asterids › Campanulid families*
*Initially written Sep 17, 2026 · Reviewed: Sep 30, 2026; Oct 21, 2026 · Edited: Sep 30, 2026; Oct 21, 2026 · Last review: Oct 21, 2026*
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License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license