1-(3-Hydroxyphenyl)thiourea is primarily used in research and development for its potential biological activities. It has been studied for its role as an inhibitor of tyrosinase, an enzyme involved in melanin production in the skin, particularly in the context of understanding enzyme mechanisms, designing enzyme inhibitors, and developing treatments for skin pigmentation disorders such as melasma, freckles, and other melanin-related abnormalities. Additionally, this compound has been explored for its antioxidant properties, making it a candidate for studies related to oxidative stress and cellular damage. In medicinal chemistry, it is investigated for its potential therapeutic applications, including its ability to interact with biological targets that may be relevant in treating various diseases. Its structural features also make it a useful intermediate in the synthesis of more complex chemical compounds for pharmaceutical and industrial applications.