Yes, dextrose is gluten-free, even when the starch was wheat
US corn sugar is made from corn starch. EFSA found wheat-based dextrose unlikely to cause a reaction in coeliac disease.
The full answer
Dextrose is glucose made by breaking starch all the way down to single sugars, then crystallizing them. In the US, the FDA's GRAS corn sugar is made from corn starch, so that ingredient never contained gluten.
In Europe the starch is often wheat. That is the detail that worries people with coeliac disease, because wheat is the grain they are told to avoid.
EFSA reviewed wheat-based glucose syrups, including dextrose, in 2007. Adults with coeliac disease ate the ingredient for 24 weeks with no harm to the intestine. Residual gluten and peptides in the samples were 0.3 to 1.4 mg per kg. EFSA's conclusion: unlikely to cause an adverse reaction in coeliac disease, provided the gluten stays under the Codex level for a gluten-free food.
That finding is about dextrose itself. Another ingredient in the same package can still be wheat, barley or rye. Read the rest of the list.
What to look for on the label
- "Dextrose" or "corn sugar"
- "Glucose" on a European label, which is the same sugar
- A certified gluten-free logo when you want the whole product checked, not just this one ingredient
Other diets
Common questions
Can people with coeliac disease eat dextrose?
Yes. US corn sugar is made from corn starch, and EFSA found wheat-based dextrose unlikely to cause a reaction.
What if the package says the starch was wheat?
EFSA still found that dextrose unlikely to affect coeliac disease. The samples it reviewed contained 0.3 to 1.4 mg of residual gluten and peptides per kg.
Safety score, rules by country, health notes and swaps.