Every clinical trial chooses the best clinical research course of action to collect as much data as possible. Before any of these medications reach the patients, it has to undergo our clinical trial phases. The first phase is also known as the recruitment phase. This is a very crucial stage of the process. It involves the selection of participants for the testing of the new treatment or drug. These participants have to meet certain criteria based on the drug or disease being treated. It involves the enrolment of 20-100 volunteers whose condition has been studied well and monitored over a specified amount of time.