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Maltodextrin is a white, nearly tasteless carbohydrate powder made by partly breaking down starch from corn, potato or rice into short chains of glucose. Food makers use it to add body, carry flavors, replace some fat or sugar, and bulk up powders, and it shows up in everything from sports drinks to supplement capsules. The FDA lists maltodextrin as generally recognized as safe (GRAS) with no limit beyond good manufacturing practice. Below: what maltodextrin is, why it is used, what the research does and does not show, how it differs from resistant maltodextrin fiber, and how to spot it on a label.
Peptide Labs does not sell maltodextrin as a product; some supplements, including a few in our store, list it among their inactive ingredients. This article is general information, not medical advice.
Key Takeaways
- Maltodextrin is a starch-derived carbohydrate made of glucose units, with about the same calories per gram as other carbohydrates.
- FDA regulation 21 CFR 184.1444 affirms it as GRAS for use in food with no limit beyond good manufacturing practice.
- It counts toward total carbohydrate on a Nutrition Facts label but not toward sugars.
- Concerns about gut effects come mainly from lab and mouse studies; human evidence is limited.
- Resistant maltodextrin is a different ingredient: a fiber that resists digestion.
What is maltodextrin?
In FDA’s words, maltodextrin is a nonsweet nutritive saccharide polymer made of glucose units linked mainly by alpha-1,4 bonds, with a dextrose equivalent (DE) below 20. Dextrose equivalent is a measure of how far the starch has been broken down: pure glucose (dextrose) is 100, and starch is close to zero. Maltodextrin sits at the low end, so it is less sweet than corn syrup solids or dextrose. The FDA regulation names corn, potato and rice starch as sources, made by partial hydrolysis with acids or enzymes. Products sold in other countries may use wheat or tapioca starch.
Because it is a chain of glucose units, digestive enzymes break maltodextrin down into glucose, and it supplies energy like other starches. That is why it behaves very differently from the fibers covered in our fiber supplement comparison, even though some names sound similar.
Why maltodextrin is in so many foods and supplements
Manufacturers like maltodextrin because it is cheap, dissolves easily, has a neutral taste and does a lot of quiet technical work:
- Bulking and carrying: it dilutes tiny amounts of flavors, sweeteners, vitamins or probiotic cultures so they can be measured and mixed evenly.
- Texture: it adds body to sauces, soups, salad dressings and low-fat foods.
- Spray drying: it helps turn liquids such as flavors or oils into free-flowing powders.
- Sports nutrition: drinks, gels and powders use it as a quickly digested carbohydrate for energy; see our electrolytes guide for how sports drinks differ.
- Supplements: capsules and tablets list it as a filler or flow agent among the other ingredients.
| Where you see it | Typical job | Label location |
|---|---|---|
| Sports drinks and gels | Quick-digesting carbohydrate | Ingredients list; total carbohydrate |
| Powdered drink mixes and sweetener packets | Bulking agent that carries sweetener | Ingredients list |
| Sauces, soups, dressings | Thickener and body | Ingredients list |
| Snack seasonings and flavorings | Carrier for flavor | Ingredients list |
| Capsules, tablets, probiotic powders | Filler or flow agent | Other ingredients |
| Gummies | Texture and bulk | Other ingredients |
Maltodextrin and FDA regulation
Maltodextrin is covered by 21 CFR 184.1444, part of FDA’s list of substances affirmed as generally recognized as safe. The regulation says it may be used in food with no limitation other than current good manufacturing practice, meaning manufacturers use only the amount needed for its technical purpose. GRAS status is a regulatory finding about intended use in food, not a promise that an ingredient suits every person or every diet.
On Nutrition Facts labels, FDA counts carbohydrate at 4 calories per gram under its general factors, and defines total sugars as free single and double sugars only (21 CFR 101.9). Maltodextrin is a longer chain, so it shows up in total carbohydrate but not in the sugars line. That is worth knowing when a powder says zero sugar: it can still deliver digestible carbohydrate from maltodextrin.
Is maltodextrin bad for you? What research shows
Most people eat maltodextrin in small amounts spread across processed foods, and FDA considers it safe for its intended uses. The questions people ask usually fall into three groups.
Blood sugar
Maltodextrin is a rapidly digested carbohydrate, so it raises blood glucose the way other refined starches do. That is useful for an athlete who wants fast fuel, but it is worth counting for anyone who watches carbohydrates, including people with diabetes, who should follow their care team’s advice. Our guides to refined carbohydrates and slower-digesting foods explain the bigger picture. In a supplement capsule the amount is usually tiny, but in a sports drink or meal-replacement powder it can be a main ingredient.
Gut bacteria and the gut lining
Headlines about maltodextrin and gut health trace back mostly to laboratory and animal work. A 2012 lab study (Nickerson and McDonald, PLoS One) found that maltodextrin helped certain strains of E. coli form biofilms and stick to cells in culture. A 2019 mouse study (Laudisi and colleagues, Cellular and Molecular Gastroenterology and Hepatology) reported that maltodextrin in drinking water stressed mucus-producing cells and made chemically induced intestinal inflammation worse. These findings are hypotheses worth studying, not evidence that maltodextrin harms people at normal intakes. Controlled human trials are lacking, so no firm conclusion can be drawn either way.
Maltodextrin side effects and sensitivities
Reported maltodextrin side effects are mostly digestive, such as bloating or gas when large amounts are eaten at once, and they overlap with what any concentrated carbohydrate can do. People who avoid wheat should read labels: under US allergen labeling law, an ingredient made from a major allergen such as wheat must name that source, so a wheat-based maltodextrin should say so. If you notice symptoms after a specific product, keep a simple food diary and talk with your clinician or a dietitian; our sugar alcohols guide covers another common cause of digestive upset in low-sugar products.
Maltodextrin vs resistant maltodextrin
Resistant maltodextrin (also sold as soluble corn fiber or under trade names such as Fibersol) is made so that many of its bonds resist human digestive enzymes. Instead of turning into glucose, much of it reaches the large intestine like other soluble fibers. In 2018 the FDA said it would allow resistant maltodextrin/dextrin to be counted as dietary fiber on Nutrition Facts and Supplement Facts labels, along with inulin, polydextrose and several others, while it updates its rules.
| Feature | Maltodextrin | Resistant maltodextrin |
|---|---|---|
| What it is | Partly broken-down starch (glucose chains) | Starch-derived fiber that resists digestion |
| Digested in the small intestine | Yes, into glucose | Mostly not |
| Where it counts on the label | Total carbohydrate | Dietary fiber (FDA 2018 guidance) |
| Typical role | Filler, carrier, quick carbohydrate | Added fiber in drinks, gummies, bars |
| FDA status | GRAS (21 CFR 184.1444) | Accepted as dietary fiber under enforcement discretion |
So a fiber gummy that lists resistant maltodextrin or soluble corn fiber is using a fiber, not a filler. Our guides to soluble fiber supplements and Metamucil vs Benefiber compare common fiber sources.
How to read a maltodextrin label
- Check the position: ingredients are listed by weight, so maltodextrin near the start of a drink mix means it is a main ingredient; near the end it is a minor helper.
- Compare total carbohydrate and sugars: a big gap with little fiber often means starch or maltodextrin.
- Look for the word resistant: resistant maltodextrin counts as fiber; plain maltodextrin does not.
- Read Other ingredients on supplements: maltodextrin there is an inactive helper, not the reason to take the product.
- Check allergen statements: a wheat source must be named.
For more on judging supplement quality beyond the ingredient list, see our guide to third-party tested supplements, and our sibling guide to carrageenan, another additive that is often misunderstood.
Frequently Asked Questions
What is maltodextrin made from?
Starch, usually from corn, potato or rice in the US, partly broken down into short glucose chains. Wheat or tapioca versions also exist and must be labeled by source when required.
Is maltodextrin bad for you?
FDA affirms it as GRAS for use in food. It is a fast-digesting carbohydrate, so it matters most for people counting carbohydrates. Gut concerns come mainly from lab and mouse studies.
What are common maltodextrin side effects?
Large amounts may cause bloating or gas, like other concentrated carbohydrates. Talk with a clinician if a product seems to cause symptoms.
Is maltodextrin a sugar?
Not on the label. FDA counts only single and double sugars as sugars, so maltodextrin appears in total carbohydrate instead.
Is resistant maltodextrin the same thing?
No. Resistant maltodextrin is a fiber that mostly resists digestion, and FDA allows it to be counted as dietary fiber.
Why is maltodextrin in my supplement?
It is usually a filler, flow agent or carrier that helps measure and mix small amounts of active ingredients.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a digestive condition. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Carrageenan: What It Is, Is It Safe, and What Studies Show, Xanthan Gum: What It Is, FDA Status, Side Effects and Substitutes, Low Glycemic Foods: Glycemic Index Chart and Glycemic Load Explained.