5-Phenylnicotinic acid is primarily utilized in the field of medicinal chemistry as a key intermediate in the synthesis of various pharmaceutical compounds. It plays a significant role in the development of drugs targeting inflammatory and autoimmune diseases due to its structural properties that allow for effective binding to specific biological targets. Additionally, it is employed in research settings to study enzyme inhibition mechanisms, particularly those involving nicotinamide derivatives. Its application extends to the production of organic light-emitting diodes (OLEDs) where it contributes to the enhancement of device efficiency and stability. The compound's versatility also makes it valuable in the synthesis of complex organic molecules for use in advanced material science.