This U.S. industry comprises establishments primarily engaged in retailing food supplement products, such as vitamins, nutrition supplements, and body enhancing supplements. Cross-References. Establishments primarily engaged in-- ? Retailing food supplement products via electronic home shopping, mail-order, or direct sale--are classified in Subsector 454, Nonstore Retailers; ? Retailing prescription and nonprescription drugs and medicines--are classified in Industry 446110, Pharmacies and Drug Stores; and ? Retailing naturally organic foods, such as fruits and vegetables, dairy products, and cereals and grains--are classified in Subsector 445, Food and Beverage Stores.