Is Curdled Protein Powder Bad For You? The Truth About Clumpy Shakes
                                
                                
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                                    4 min read                                
                            
                                According to nutrition experts, a protein's quality can decrease over time, especially if not stored properly, which begs the question: is curdled protein powder bad for you? The truth is that curdling is often a harmless, physical reaction caused by heat or acid, and does not automatically mean your protein powder is spoiled.