6-Hydroxyindole is primarily utilized in the field of organic synthesis, where it serves as a key intermediate in the production of various pharmaceuticals and bioactive compounds. Its structure is particularly valuable in the development of serotonin analogs and other indole derivatives, which are crucial in neurological and psychiatric drug research. Additionally, it finds application in the synthesis of dyes and pigments due to its ability to form stable, colored complexes. In biochemical studies, 6-Hydroxyindole is used to investigate enzymatic processes and metabolic pathways involving indole compounds. Its role in the synthesis of natural products and fine chemicals further underscores its importance in industrial and academic research.