HERSHEY’S a2 Milk®, Chocolate 2% Reduced Fat Milk, 59 fl oz. is made with deliciously smooth cow’s milk and classic HERSHEY’S cocoa. a2 Milk comes from cows that naturally produce only the A2 protein and no A1. Published research suggests a2 Milk may help avoid stomach discomfort in some people. All cows originally produced only the A2 protein. A natural change occurred over a thousand years ago, which caused the A1 protein to appear as a genetic variation. Today, most milk comes from cows that produce both A1 and A2 protein in their milk. But our a2 Milk comes from cows that only produce the A2 protein. Feel the a2 difference!