Is It Kosher? M&Ms sold in the United States are certified kosher dairy by the Orthodox Union, so the bag carries an OU-D. M&Ms made for the UK and much of Europe are a different story: they are not kosher certified, and the red coating often uses carmine (E120), an insect-derived dye. The country on the back of the bag matters more than the brand on the front.
Is It Kosher? Yes, Oreos sold in the United States are kosher. Every standard variety carries OU-D certification from the Orthodox Union, meaning they are certified kosher dairy. Outside the US the answer gets more complicated, and this guide walks through exactly what to check on the package.