6-Phenylhexanoic acid is primarily used in organic synthesis as a building block for the production of more complex chemical compounds. It serves as an intermediate in the manufacture of pharmaceuticals, particularly in the development of drugs that target metabolic disorders. Additionally, it is utilized in the synthesis of liquid crystals, which are essential components in display technologies like LCDs. Its phenyl group and carboxylic acid functionality make it a versatile reagent in various chemical reactions, including esterification and polymerization processes.