4-(3-Aminophenyl)butanoic acid hydrochloride is primarily used in organic synthesis as an intermediate for the production of various pharmaceuticals. It plays a key role in the development of compounds with potential therapeutic effects, particularly in the design of drugs targeting neurological and cardiovascular disorders. Its structure allows for further functionalization, making it valuable in medicinal chemistry research. Additionally, it is utilized in the synthesis of dyes and other specialty chemicals, contributing to advancements in material science and industrial applications.