Oatly products sold in the United States are certified gluten-free, but Oatly products sold in Europe are not. This distinction matters if you have celiac disease or gluten sensitivity, because the same brand uses different oat sourcing depending on the market.
Oatly in the US Uses Certified Gluten-Free Oats
Oatly sources only certified gluten-free oats for its US product line. The packaging carries the Certified Gluten-Free mark from GFCO (Gluten-Free Certification Organization), which requires products to test below 10 parts per million of gluten. That’s stricter than the FDA’s threshold of 20 ppm for gluten-free labeling. This certification applies across Oatly’s US range, including its oat milks, frozen desserts, and creamers.
A look at the ingredient lists confirms this. Oatly’s vanilla frozen dessert, for example, contains oat milk, coconut oil, sugar, and standard stabilizers like locust bean gum and guar gum. No malt, wheat starch, or other gluten-containing additives show up. The product carries a gluten-free certificate.
Oatly in Europe Is Not Gluten-Free
If you’re traveling in Europe or ordering Oatly from a European retailer, the rules change. Oatly sold in Europe does not carry gluten-free labeling. Europe doesn’t have the same “purity protocol” oat supply chain that the US does. Purity protocol means the oats are grown, harvested, and processed in dedicated facilities that never handle wheat, barley, or rye. Without that system, European oats are more likely to carry trace gluten from cross-contact during farming or milling.
EU regulations require oats to be specifically labeled gluten-free to be considered safe for people with celiac disease. Since Oatly’s European products don’t meet that standard, they don’t carry the label. The brand itself, the recipe, and the packaging may look similar, but the gluten status is fundamentally different depending on where you buy it.
Oats and Celiac Disease: A Complicated Relationship
Even when oats are completely free of wheat contamination, they contain a protein called avenin that can cause problems for some people with celiac disease. A 2025 study published in the journal Gut tested purified, contamination-free oat protein in 29 celiac patients and found that 38% showed measurable immune activation and 59% experienced acute symptoms like bloating or nausea.
The good news: for most of those patients, the reactions didn’t cause lasting intestinal damage. Prolonged oat exposure didn’t lead to the kind of gut deterioration that wheat causes. The immune response was real but typically not strong enough to sustain symptoms or trigger the villous atrophy that defines active celiac disease.
The exception was roughly 3% of participants. In one patient out of 29, oat avenin triggered a full inflammatory response that looked virtually identical to what wheat gluten does, complete with the same type and intensity of immune signals. For that small subset of people, oats themselves are the problem, not contamination. Severe symptoms like vomiting after eating oats may be a marker of this wheat-like response, and avoiding oats entirely is the safest course.
How to Tell If Oats Are Safe for You
If you have celiac disease and tolerate oats well, Oatly’s US products are a solid option. The GFCO certification means the contamination risk is well-controlled, and the ingredient lists are clean of hidden gluten sources. Start with small amounts if you’re introducing oats into a gluten-free diet for the first time, and pay attention to how your body responds over a few weeks.
If you notice digestive symptoms, bloating, or nausea after drinking Oatly (or eating any pure oats), that doesn’t necessarily mean the product was contaminated. You may be in the group that reacts to avenin itself. Tracking your symptoms over multiple exposures gives you a clearer picture than a single serving would. Some people with celiac disease find they tolerate small amounts of oats but react at higher doses, since the immune response in the Gut study was dose-dependent.
For people without celiac disease or gluten sensitivity, none of this is a concern. Oatly’s US products are gluten-free by any standard, and avenin reactions are specific to celiac patients whose immune systems are already primed to react to grain proteins.