Can Protein Powder Go Bad in a Hot Car?
                                
                                
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                                    4 min read                                
                            
                                One study found that whey protein stored at 95°F saw its shelf life reduced to around nine months, demonstrating that, yes, protein powder can go bad in a hot car and other hot environments. Exposure to elevated temperatures significantly accelerates degradation, compromising both the powder's quality and its taste.