Information on GNC in Thornton, CO 80233 Outlet Note Regular Brands GNC Colorado Thornton 330214 Rating 4.7 based on 97 votes Address 3905 East 104th Avenue Thornton, CO 80233 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 - Broomfield GNC Outlet - Arvada GNC Outlet - Brighton GNC Outlet - Arvada People Also Viewed