Information on GNC in Portsmouth, NH 03801 Outlet Note Regular Brands GNC New Hampshire Portsmouth 329319 Rating 4.7 based on 97 votes Address 1303 Woodbury Avenue Portsmouth, NH 03801 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 - Durham GNC Outlet - Dover GNC Outlet - Exeter GNC Outlet - Lee People Also Viewed