Information on GNC in Merrimack, NH 03054 Outlet Note Regular Brands GNC New Hampshire Merrimack 328283 Rating 4.7 based on 97 votes Address 416 Daniel Webster Highway Merrimack, NH 03054 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 - Amherst GNC Outlet - Londonderry GNC Outlet - Bedford GNC Outlet - Hudson People Also Viewed