Information on GNC in South Portland, ME 04106 Outlet Note Regular Brands GNC Maine South Portland 329949 Rating 4.7 based on 97 votes Address 279 Main Street South Portland, ME 04106 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 - Falmouth GNC Outlet - Biddeford GNC Outlet - Biddeford GNC Outlet - Buxton People Also Viewed