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GNC Holdings, LLC, based in Pittsburgh, Pennsylvania, is a renowned retail company specializing in health and nutrition-related products. With a focus on vitamins, supplements, minerals, herbs, sports nutrition, diet, and energy products, GNC is committed to enhancing the well-being of its customers. While specific information on third-party or in-house lab testing is not readily available, GNC's reputation for quality suggests a dedication to providing reliable and effective health solutions. This SEO-optimized content aims to educate readers on GNC's comprehensive approach to health and nutrition, emphasizing the brand's commitment to supporting fitness, wellness, and overall health without sounding like marketing material.