Are GNC Brand Supplements Third-Party Tested? Understanding Quality Control
                                
                                
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                                    4 min read                                
                            
                                Following a high-profile investigation by the New York State Attorney General in 2015, GNC significantly expanded its quality control and third-party testing protocols. This action led many consumers to question, 'Are GNC brand supplements third-party tested?' The answer reveals a complex process that combines internal and external verification.