Do you mix casein with milk or water? Here's the best choice for your goals
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                Casein protein is renowned for its slow-digesting properties, delivering a sustained release of amino acids to muscles over several hours. But a common question is whether to mix casein with milk or water, and the answer largely depends on your personal fitness objectives and dietary needs.