GNC Holdings, Inc., together with its subsidiaries, operates as a specialty retailer of health, wellness, and performance products. It operates through three segments: U.S. and Canada, International, and Manufacturing/Wholesale. Its products include protein, performance supplements, weight management supplements, vitamins, herbs and greens, wellness supplements, health and beauty, food and drink, and other general merchandise. The company also provides third-party contract manufacturing services. It sells its products under the GNC proprietary brands, as well as under third-party brands. The company operates a network of approximately 9,000 locations under the GNC brand worldwide. It sells its products through company-owned retail stores and its Website GNC.com, as well as third-party Websites; and domestic and international franchise activities. GNC Holdings, Inc. has a strategic partnership and China joint venture agreement with Harbin Pharmaceutical Group Holding Co., Ltd. The company was founded in 1935 and is headquartered in Pittsburgh, Pennsylvania.