Sweeteners
Crystalline fructose
Definition
What it is
High-fructose corn syrup: heavily processed sweetener linked to metabolic syndrome, insulin resistance, and non-alcoholic fatty liver disease.
On the label
How it appears on labels
- crystalline fructose
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
Crystalline fructose is a nearly pure fructose sweetener, made by processing cornstarch into a syrup and then crystallizing out the fructose. It is sweeter than table sugar and dissolves well, so manufacturers use it to sweeten drinks and processed foods while using a bit less. Unlike table sugar, which is half fructose and half glucose, crystalline fructose is almost entirely fructose.
Assessment
Why it is flagged
Fructose is metabolized mainly in the liver, and research has focused on whether high intakes of fructose-heavy sweeteners are more strongly associated with metabolic problems than glucose. Studies and reviews have linked diets high in added fructose with insulin resistance, elevated blood fats, and non-alcoholic fatty liver disease, though much of this evidence comes from high-intake and animal studies, and the effect of typical dietary amounts is still debated. Crystalline fructose is not banned; regulators treat it as an added sugar. Clear Label flags it at high severity because it is a concentrated fructose source that provides no nutrients beyond calories, and because some people track digestive discomfort with fructose, which the gut absorbs less efficiently than glucose. That digestive pattern is worth testing in your own logs.
In the aisle
Where it commonly shows up
- Sports and energy drinks
- Flavored and enhanced waters
- Some sodas and iced teas
- Powdered drink mixes
- Baked goods and snack bars
- Some yogurts and frozen desserts
Practical
Reading the label
It is listed as crystalline fructose or sometimes just fructose, and is different from high-fructose corn syrup even though both are corn-derived. It shows up in the added-sugars line on US nutrition labels.
Alternatives
If you want to avoid it
Some people choose drinks with less total added sugar or unsweetened options, especially those who notice digestive symptoms with high-fructose foods.
FAQ
Common questions
Is crystalline fructose the same as high-fructose corn syrup?
No. Both come from corn, but crystalline fructose is nearly pure fructose, while high-fructose corn syrup is a blend of fructose and glucose. Crystalline fructose has a higher fructose share.
Is fructose worse than other sugars?
Research suggests fructose is metabolized differently and that high intakes are associated with liver and metabolic effects, but the impact of typical amounts is still debated. It is best understood as an added sugar to account for in your total intake.
Why do some people get digestive symptoms from it?
The gut absorbs fructose less efficiently than glucose, so large amounts can cause bloating or discomfort in sensitive people. Logging foods and symptoms is the honest way to see whether it affects you.
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.