L-fenylalanine ni aside amine yingenzi, niyo shingiro ryubaka proteine. Ntishobora guhuzwa ubwayo mumubiri kandi igomba gukoreshwa binyuze mumirire. L-fenylalanine irashobora guhinduka mubindi bintu byingenzi mumubiri, nka tirozine, norepinephrine, na dopamine. L-phenylalanine ningirakamaro ya aside amine ifite akamaro kanini mubuzima kandi ikoreshwa cyane mubyongeweho imirire, ubuzima bwamarangamutima nibitekerezo, imirire ya siporo, no gucunga ibiro.