Jobs in the dietary supplement industry include sales representatives who sell dietary supplements, nutrition products, and vitamins to customers and managers of dietary supplement companies and manufacturers who oversee production, sales, inventory, and company processes. The duties of a sales representative in the dietary supplements industry are to educate customers and supply them with a company’s dietary supplements. You also upsell products and follow up with customers to ensure satisfaction. The responsibilities of a supervisor include monitoring employee and financial performance, hiring and training new employees, overseeing sales processes and revenue, and managing customer relations and accounts.