GNC Holdings, Inc. engages in the global retail of health, wellness and performance products, including vitamins, minerals and herbal supplements products, sports nutrition products and diet products. It operates through the following segments: U.S. & Canada, International and Manufacturing or Wholesale. The U.S. and Canada segment generates revenues primarily from sales of products to customers. The International segment generates revenue primarily from its international franchisees through product sales, royalties and franchise fees and also includes its China operations and The Health Store. The Manufacturing or Wholesale segment comprises of its manufacturing operations in South Carolina and its wholesale partner relationships. The company was founded by David Shakarian in 1935 and is headquartered in Pittsburgh, PA.