L-Phenylalanine bụ amino acid dị mkpa na ọ bụ mmalite nke amino acid tyrosine.Ahụ enweghị ike ịme phenylanie mana ọ chọrọ phenylalanie iji mepụta protein.Ya mere, mmadụ kwesịrị inweta phenylanie site na nri.A na-ahụ ụdị phenylalanie atọ na okike: D-phenylalanine, L-phenylalanine, na DL-phenylalanine.N'ime ụdị atọ a, L-phenylalanine bụ ụdị okike a na-achọta n'ọtụtụ nri nwere protein, gụnyere anụ ehi, anụ ọkụkọ, anụ ezi, azụ, mmiri ara ehi, yogọt, àkwá, cheese, ngwaahịa soy, na ụfọdụ mkpụrụ na mkpụrụ.