Is Starbucks’ oat milk gluten-free?

The answer is maybe. While oats are naturally gluten-free, they are sometimes contaminated with gluten due to shared equipment with wheat, barley, or rye. The oat milk Starbucks uses is supplied by Oatly, which notes that their oat milk is made in a factory that also handles gluten. Therefore, although they strive to minimize contamination, they cannot 100% guarantee that their oat milk is gluten-free. So depending on your sensitivity to gluten, the oat milk at Starbucks may not be safe for you.