Information on GNC in Ada, OH 45810 Outlet Note Regular Brands GNC Ohio Ada 325066 Rating 4.7 based on 97 votes Address 610 s Main Street Ada, OH 45810 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 - Bellefontaine GNC Outlet - Bowling Green GNC Outlet - Brookville GNC Outlet - Ashland People Also Viewed