In conjunction to Focus Group studies, you could also participate in "Clinical Trials".  Clinical Trial studies are the most lucrative of them all.  They focus on preventing, diagnosing, treating and controlling symptoms of sickness and disease.  Clinical Trials are sponsored or funded by a variety of organizations or individuals such as physicians, medical institutions, foundations, voluntary groups, and pharmaceutical companies. Trials can take place in a variety of locations, such as hospitals, universities, doctors' offices, or community clinics. They offer FREE physician attention, FREE study medications, FREE exams, FREE hospice services and compensation up to $10,000 per study. The availability of Clinical Trial studies are so plenteous until you could easily make a 6 figure income just by doing them alone. Clinical Trial studies are available for healthy individuals and people with medical conditions.