Yes, clinical trials can often provide early access to a new intervention that is generally not available outside of the study. For example, trial participants may be the first to benefit from a new treatment, or gain information about their health status and health risks they wouldn’t otherwise have.
In early clinical studies, the safety, side effects and effectiveness of the intervention are still being ascertained. Despite all the research leading up to the trial (including earlier phases), there is always a chance that therapy will not work, could cause certain side effects, or ultimately not be approved by the FDA. In randomized studies, patients cannot choose which group they are assigned to; in blinded studies, patients do not know which intervention they are receiving (or, in some cases, whether they are receiving a placebo).
While being in a trial cannot always guarantee immediate effects, the advances made in medicine through this process will benefit your future health and others around the world.