Information on GNC in Johnstown, PA 15904 Outlet Note Regular Brands GNC Pennsylvania Johnstown 327594 Rating 4.7 based on 97 votes Address 1501 Scalp Avenue Johnstown, PA 15904 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 - Johnstown GNC Outlet - Johnstown GNC Outlet - Johnstown GNC Outlet - Johnstown People Also Viewed