Whether dextrin is gluten-free or not depends on its original source.

What is Dextrin?

Dextrins are made from starches and can be used to “glue” envelopes shut, to enhance the crispness of food, and to thicken or bind pills.

What is Dextrin Made From?

In the United States, dextrin is often made from gluten-free ingredients such as corn or tapioca, making it gluten-free. Sometimes dextrin is made from wheat, but foods in the United States that contain dextrin made from wheat will label it as so.

Note that dextrin made from wheat is typically so highly processed that it is generally considered safe for individuals with celiac disease and other gluten-related disorders to consume (as it would contain less than 20 ppm of gluten, making it legal to be labeled gluten-free). However, some people still react to even the tiniest amount of gluten, so be sure to read labels and do what feels right to you.