Due to its potent carcinogenic properties, 4-Aminobiphenyl is strictly regulated and its industrial applications have been largely curtailed in many countries. Historically, it served as a key intermediate in the synthesis of azo dyes and pigments, contributing to vibrant colors in textiles and materials. It has also been used in the development of certain pharmaceuticals, particularly in studying compounds with potential therapeutic effects, and in the manufacture of rubber chemicals to enhance material properties. Currently, it is primarily utilized in controlled research settings to investigate chemical toxicity, serving as a model carcinogen for studying cancer mechanisms in animal models, and in developing detection methods for carcinogens in the environment and human body. Rigorous safety protocols are essential when handling this substance.