Information on GNC in Allenstown, NH 32751 Outlet Note Regular Brands GNC New Hampshire Allenstown 325135 Rating 4.7 based on 97 votes Address 46 Allenstown Road Allenstown, NH 32751 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 - Hooksett GNC Outlet - Concord GNC Outlet - Concord GNC Outlet - Manchester People Also Viewed