You may have seen inulin listed on a supplement label or tucked into the ingredient list of a food you buy regularly. But what is inulin, exactly?
Here's what it does in the body, where you can find it, and what to know before adding more to your diet.
Key Takeaways
Inulin is a soluble, fermentable fiber with prebiotic properties found naturally in many plants.1
Chicory root and sunchokes are among the richest natural sources, but inulin is also found in several everyday plant foods.2
There is no separate suggested U.S. daily target for inulin. The FDA Daily Value for total dietary fiber is 28 grams.3
Increasing fiber quickly can cause temporary gas or bloating, so it's usually better to add more gradually.4
Inulin belongs to a group of carbohydrates called fructans. It's made mostly from chains of fructose molecules, but your body does not digest those chains the same way it digests ordinary sugars.1
Inulin passes through the small intestine largely intact. Once it reaches the colon, gut microbes can ferment it and use it as a food source. That prebiotic activity is one of the main reasons inulin is added to fiber supplements and other nutrition products.1
If you see “chicory root fiber” on a label, there's a good chance inulin is involved. Chicory root is one of the main commercial sources of inulin, along with sunchokes, also known as Jerusalem artichokes.2
The terms aren't always interchangeable on every label you'll encounter, but chicory-derived inulin is widely used in foods and supplements.
Because human digestive enzymes cannot break down inulin, it reaches the large intestine instead of being absorbed earlier in digestion.1
Once there, certain gut bacteria ferment it. That process produces compounds called short-chain fatty acids, or SCFAs. Human studies on inulin-type fructans support their prebiotic effect and show changes in beneficial gut-bacterial populations after regular intake.1
That fermentation is also why suddenly eating a lot more inulin can leave some people feeling gassy or bloated. Your digestive system may need extra time to adjust.4
Inulin occurs naturally in thousands of plant species, although the amounts vary.2
Chicory root and sunchokes are rich sources of inulin. Garlic, onions, leeks, asparagus, wheat, and barley also contain inulin, along with smaller amounts in foods such as bananas.2
You don't really need to seek out unusual ingredients to get inulin from your food. Some of the foods that provide it are probably already part of your diet.
How does inulin powder compare with the inulin already present in food? It's essentially a concentrated form of the same type of fiber, usually extracted from plants like chicory root.2
You may find inulin powder sold on its own as a fiber supplement. Food manufacturers also use it as an ingredient because it adds fiber and can affect a product's texture.
Inulin powder can make it easier to increase your fiber intake in measured amounts, but don't assume more is automatically better—what feels comfortable can vary from person to person.
There is no U.S. Daily Value specifically for inulin. Instead, it counts toward your overall fiber intake. For adults, the FDA sets the Daily Value for dietary fiber at 28 grams for a 2,000-calorie diet.3
If you're adding inulin through a supplement, there's no reason to jump straight to taking a large amount. Increasing fiber too quickly can cause gas, bloating, or abdominal cramping. Gradually increasing your intake can make the adjustment a lot easier.4
You should also remember that inulin from food counts, too. Your total intake can come from a combination of the foods you eat, plus any fiber supplements you use.
The answer has two sides. From a nutrition standpoint, inulin is used as a source of dietary fiber and as a prebiotic ingredient.1 It can be added to supplements or foods for those purposes.
It also has practical uses in food production. Inulin can help with texture and moisture, and manufacturers may use it to replace some fat or sugar in certain products.2 That's why you might spot it in foods that don't immediately look like obvious sources of fiber.
(Read more about the importance of fiber for gut health.)
Inulin is included in both AG1 Next Gen and AG1 Essentials Gummies.
AG1 Next Gen includes inulin from chicory root as part of its Active Superfood and Prebiotic Complex, along with probiotics, vitamins, minerals, and whole-food-sourced ingredients designed to support gut health and daily nutrition.*
If you prefer a gummy, AG1 Essentials Gummies provide 5 grams of daily fiber from tapioca fiber and chicory root inulin, plus 50 vitamins, minerals, and whole-food-sourced ingredients.*
Both give you a way to include prebiotic fiber in your daily routine, with different formats depending on what works best for you.*
The most common issues are digestive. Increasing your fiber intake too quickly can cause gas, bloating, or abdominal cramps.4 Starting with a smaller amount and increasing gradually may make inulin easier to tolerate.
Chicory root and sunchokes are among the richest sources. Inulin is also naturally present in garlic, onions, leeks, asparagus, and wheat.2
Inulin occurs naturally in food and is also commonly used in supplements. There is no specific daily requirement for inulin, so your overall fiber intake and individual tolerance are more important to consider.
Inulin passes through the small intestine without being fully digested. Gut microbes then ferment it in the colon, which is why inulin is considered a prebiotic fiber.1
1. Hughes RL, Alvarado DA, Swanson KS, Holscher HD. The prebiotic potential of inulin-type fructans: a systematic review. Adv Nutr. 2022;13(2):492-529. doi:10.1093/advances/nmab119.
2. Qin YQ, Wang LY, Yang XY, et al. Inulin: properties and health benefits. Food Funct. 2023;14(7):2948-2968. doi:10.1039/D2FO01096H.
3. US Food and Drug Administration. Daily Value on the Nutrition and Supplement Facts Labels. https://www.fda.gov/food/nutrition-facts-label/daily-value-nutrition-and-supplement-facts-labels
4. Fiber. MedlinePlus Medical Encyclopedia. Updated November 15, 2024. https://medlineplus.gov/ency/article/002470.htm
5. Lightowler H, Thondre S, Holz A, Theis S. Replacement of glycaemic carbohydrates by inulin-type fructans from chicory (oligofructose, inulin) reduces the postprandial blood glucose and insulin response to foods: report of two double-blind, randomized, controlled trials. Eur J Nutr. 2018;57(3):1259-1268. doi:10.1007/s00394-017-1409-z.