Information on GNC in Philadelphia, PA 19124 Outlet Note Regular Brands GNC Pennsylvania Philadelphia 329152 Rating 4.7 based on 97 votes Address 3900 Castor Avenue Philadelphia, PA 19124 Phone Hours may vary in different stores. For accurate hours, please contact each store directly. Suite643 Hours may vary in different stores. For accurate hours, please contact each store directly. Nearby GNC Outlet GNC Outlet - Philadelphia GNC Outlet - Philadelphia GNC Outlet - Philadelphia GNC Outlet - Philadelphia People Also Viewed