If you suffer from asthma, allergies, and frequent respiratory problems, you may be able to juice your way to better breathing. A large number of studies show that you can increase your breathing capacity by consuming a diet rich in vitamins A, C, and D; folic acid; zinc; omega-3 fatty acids; and other nutrients. Because these vitamins and minerals are all found in fresh fruits and vegetables, you can create homemade juices that contain concentrated “doses” of natural medicine by mixing and matching those that foster better breathing.