Information on GNC in Troy, MI 48098 Outlet Note Regular Brands GNC Michigan Troy 330274 Rating 4.7 based on 97 votes Address 1981 South Boulevard W Troy, MI 48098 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 - Bloomfield Hills GNC Outlet - Auburn Hills GNC Outlet - Bloomfield Hills GNC Outlet - Auburn Hills People Also Viewed