Granulated sugar does not contain gluten. It is pure sucrose, a simple carbohydrate made of glucose and fructose. There is no protein of any kind in granulated sugar, and gluten is a protein found in wheat, barley, and rye. The two are chemically unrelated.
Why Sugar Is Naturally Gluten-Free
Gluten is a group of proteins that forms when wheat flour meets water. Sugar, by contrast, is a carbohydrate. Granulated white sugar is refined from either sugarcane or sugar beets, neither of which contains gluten proteins. The refining process further strips away everything except the sucrose molecule itself, leaving no protein, fiber, or fat behind. A teaspoon of granulated sugar is essentially 100% carbohydrate.
This applies regardless of whether the sugar comes from cane or beets. Both sources produce chemically identical sucrose once refined. Raw cane sugar, organic sugar, and brown sugar are also gluten-free, since they differ from white sugar only in how much molasses remains after processing.
What Major Brands Say
Domino Foods, one of the largest sugar distributors in the U.S., has issued a formal statement confirming that none of its products contain gluten from wheat, barley, rye, oats, or any crossbred hybrids. The company says it has verified with suppliers that no gluten-containing grains are present in any ingredients, processing aids, or cleaning chemicals used during manufacturing. This covers their refined sugar, raw cane sugar, organic sugar, brown sugar, and molasses products.
Not every sugar brand carries a “gluten-free” label on the package, but that doesn’t mean the product contains gluten. The FDA’s gluten-free label is voluntary. Manufacturers can choose whether to use it, even when a product clearly qualifies. A bag of granulated sugar without the label is still gluten-free by nature.
The FDA Standard for Gluten-Free Claims
When a food does carry a “gluten-free” label, the FDA requires it to contain fewer than 20 parts per million of gluten. The Gluten-Free Certification Organization (GFCO), a third-party certifier whose logo appears on many packaged foods, uses an even stricter threshold of 10 parts per million. Plain granulated sugar would easily meet both standards, since it contains no gluten proteins at all.
One Exception to Watch: Powdered Sugar
Granulated sugar is straightforward, but powdered (confectioners’) sugar deserves a closer look. Manufacturers add a small amount of anti-caking agent to powdered sugar to prevent clumping. The most common choices are cornstarch, potato starch, or tricalcium phosphate, all of which are gluten-free.
However, wheat starch can also be used as an anti-caking agent. This is uncommon, but it does happen. If you have celiac disease or a serious gluten sensitivity, check the ingredient list on powdered sugar before buying. If the label lists cornstarch or potato starch, you’re fine. If it lists “starch” without specifying the source, consider choosing a different brand or one that carries a gluten-free certification.
This concern applies only to powdered sugar. Granulated sugar, brown sugar, turbinado sugar, and other forms that don’t require anti-caking agents have no added ingredients that could introduce gluten.
Cross-Contamination Risks
In a factory that processes only sugar, cross-contamination with gluten is not a realistic concern. Sugar refineries and packaging facilities typically handle sugarcane or sugar beets and nothing else. This is different from, say, a facility that packages both flour and sugar on shared equipment.
Where cross-contamination becomes more relevant is in your own kitchen or at a bakery. Sugar stored next to open flour, measured with the same scoop, or used on a shared prep surface could pick up trace amounts of gluten. If you’re managing celiac disease, keeping your sugar in a sealed container and using dedicated utensils eliminates this risk.
Flavored and Specialty Sugars
Plain granulated sugar is a single ingredient, but flavored or specialty sugars may contain additives worth checking. Cinnamon sugar, vanilla sugar, and other blended products sometimes include natural flavors, extracts, or other ingredients that could theoretically be processed with gluten-containing grains. These products are low risk, but reading the label takes only a few seconds and gives you certainty. If a flavored sugar lists wheat or barley in the ingredients, or includes a “may contain” allergen warning, choose an alternative.