Urea-13C,15N2 is a form of urea labeled with isotopes 13C and 15N. Urea serves as a potent protein denaturant, acting through direct and indirect mechanisms. It is also an effective moisturizer and keratolytic agent, and is used as a diuretic. Blood urea nitrogen (BUN) is utilized for assessing kidney function. Additionally, urea is widely employed as a nitrogen source in fertilizers and is an important raw material in the chemical industry.