GNC Holdings Inc., the nation's largest specialty vitamin retailer with more than 8,000 stores, wants to persuade its most loyal customers to spend more money at stores. The company has
been sending individualized mailings to 1 million of its 7 million Gold Card members a month since September. GNC's eight-page mySource catalogs are customized to each member, based on previous buying
habits and any demographic data they've collected on the person, including age and gender.
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