Kallikrein is primarily used in medical and therapeutic applications due to its role in regulating blood pressure and inflammation. It is often employed in treatments for hypertension and cardiovascular diseases, as it helps in the production of bradykinin, a peptide that promotes vasodilation. Additionally, kallikrein is utilized in diagnostic assays to measure its activity in blood or urine, aiding in the detection of conditions like pancreatic disorders or prostate cancer. In skincare, kallikrein inhibitors are incorporated into products to reduce inflammation and improve skin barrier function, making it beneficial for managing conditions like rosacea or eczema. Its application in research also extends to studying its involvement in various physiological and pathological processes.