Phase I studies are the first step in clinical trials and involve testing the safety and dosage of a new treatment or drug on a small group of healthy volunteers. These studies are crucial to determining the safety profile of the drug and identifying any potential adverse effects. The dosage is also carefully evaluated to determine the appropriate level of the treatment. Phase I studies are closely monitored, and the data collected is used to determine whether to proceed to the next phase of clinical trials. These studies play a critical role in developing safe and effective treatments for various medical conditions.