It is a scientific study to determine safety and effectiveness of specific medical drugs, treatments, and devices. A patient must meet the trial’s specific criteria which might include such factors as age, medication taken, and medical history. Patients may be asked to perform a series of tests (such as blood and breathing) to further determine their eligibility in the trial, all at no cost to the patient. Once qualified, the patient will be asked to take a treatment, come in for a certain amount of office visits, and voice his opinion about the product.