N-Phenylthiourea is primarily used in scientific research as a selective inhibitor of tyrosinase, an enzyme involved in melanin production. This property makes it valuable in studies related to skin pigmentation and the development of treatments for hyperpigmentation disorders. It is also employed in biochemical assays to investigate enzyme mechanisms and inhibition kinetics. Additionally, N-Phenylthiourea has been utilized in toxicology studies to explore its effects on organisms, particularly in relation to its ability to induce goiter in certain species. In industrial applications, it serves as a corrosion inhibitor for metals, protecting them from degradation in harsh environments such as cooling water systems and process fluids. Its role in organic synthesis includes acting as a reagent or intermediate in the production of various chemical compounds, including pharmaceuticals and pesticides.