What's good for the GNC customer is great for the company's bottom line. GNC Holdings operates the world's leading nutritional-supplements retail chain devoted to items such as vitamins, supplements, minerals, and dietary products. The firm manufactures private-label products for Rite Aid, Sam's Club, and PetSmart and drugstore.com. Altogether, GNC boasts more than 9,000 stores, consisting of almost 4,000 company-owned stores in the US, Canada, and Puerto Rico, followed by 3,169 franchised stores in about 50 countries, and 2,372 store-within-a-store sites in Rite Aid locations. Fast-growing GNC Holdings was founded as a health food store in Pittsburgh in 1935.