Understanding the Ingredients: What is school milk made of?
                                
                                
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                                    4 min read                                
                            
                                According to the USDA, fluid milk is a mandatory component for reimbursable school meals in the National School Lunch Program, but what is school milk made of? At its core, school milk is simply cow's milk that has undergone specific processing and is fortified with essential vitamins to meet federal nutritional guidelines.