Information on GNC in Haslett, MI 48840 Outlet Note Regular Brands GNC Michigan Haslett 327249 Rating 4.7 based on 97 votes Address 1589 Haslett Road Haslett, MI 48840 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 - Brighton GNC Outlet - Burton GNC Outlet - Ann Arbor GNC Outlet - Alma People Also Viewed