Sweeteners
Isomalt
Definition
What it is
Sugar alcohol: commonly found in 'sugar-free' products; can cause gas, bloating, and diarrhea at moderate doses; maltitol and sorbitol still raise blood glucose. Most sugar alcohols are high-FODMAP polyols (the 'P' in FODMAP); sorbitol and mannitol are the primary triggers, while xylitol, maltitol, isomalt, and lactitol all carry similar GI risk in sensitive individuals.
On the label
How it appears on labels
- isomalt
Regulation
Regulatory status
No bans or restrictions are recorded for this ingredient in the jurisdictions clearlabel tracks (US, EU, UK, Canada, Japan, Australia/NZ, Brazil).
Explainer
In plain language
Isomalt is a sugar alcohol made from beet sugar and used as a low-calorie sweetener. It is best known for hard candies and sugar-free sweets because it resists melting and does not brown easily, which also makes it popular for decorative candy work. It provides sweetness and bulk with fewer calories than sugar and a smaller effect on blood sugar.
Assessment
Why it is flagged
Like other sugar alcohols, isomalt is only partly absorbed, so the rest travels to the large intestine where it can draw in water and be fermented by gut bacteria. That can lead to gas, bloating, and a laxative effect, especially at moderate to high doses, which is why many products carry an 'excess consumption may have a laxative effect' style notice. Isomalt is a polyol, the 'P' in the FODMAP framework, so people sensitive to FODMAPs may react more strongly. Regulators including the FDA permit it as a safe additive, and it raises blood glucose less than sugar. Clear Label flags it as low severity because the main issue is digestive comfort, and the response is very individual, which makes it a good candidate to test in your own logs.
In the aisle
Where it commonly shows up
- Sugar-free hard candies and lollipops
- Sugar-free chocolate and toffee
- Decorative candy and cake showpieces
- Sugar-free gum and mints
- Cough drops and lozenges
- Some sugar-free baked goods
Practical
Reading the label
Isomalt is usually named directly in the ingredient list and often appears alongside a laxative-effect warning on the package. It is a common base in products labeled sugar-free or no sugar added.
Alternatives
If you want to avoid it
Some people who react to sugar alcohols choose small amounts of regular sweets instead, or sweeteners like stevia or monk fruit that are not polyols. Comparing the sweetener on two sugar-free products can help you find ones that agree with you.
FAQ
Common questions
Does isomalt raise blood sugar?
Isomalt has a smaller effect on blood glucose than table sugar because it is only partly absorbed. It is not zero, but it is lower, which is why it is used in many sugar-free products.
Why do sugar-free candies with isomalt upset my stomach?
The part of isomalt that is not absorbed reaches the large intestine, where it can pull in water and be fermented, causing gas, bloating, or a laxative effect. This is dose-related and varies a lot between people.
Is isomalt a high-FODMAP ingredient?
Yes. Isomalt is a polyol, the category of FODMAPs, so people following a low-FODMAP approach or with sensitive digestion often watch it.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.