Oatly barista, Oatly ice cream, Oatly yogurt, and other Oatly milks are gluten free within the US, but they are not gluten free in other countries. Other oat milks are not safe for celiacs by default, they must be made with certified gluten free oats, which Oatly US uses in their products.
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Barista Oat Milk, 32 fl oz at Whole Foods Market
Is Oatly Barista Gluten Free? - The Gluten Guide