I-Phenylalanie iyimfuneko ye-amino acid kwaye isisandulela se-amino acid tyrosine.Umzimba awukwazi ukwenza i-phenylalanie kodwa ufuna i-phenylalanie ukuvelisa iiprotheni.Ke, iimfuno zomntu zokufumana i-phenylalanie ekutyeni.Iifom ze-3 ze-phenylalanie zifumaneka kwindalo: D-phenylalanine, L-phenylalanine, kunye ne-DL-phenylalanine.Phakathi kwezi ntlobo zintathu, i-L-phenylalanine yindlela yendalo efumaneka kuninzi lokutya okuqulethe iiprotheni, kubandakanywa inyama yenkomo, inkukhu, ingulube, intlanzi, ubisi, i-yogurt, amaqanda, i-cheeses, iimveliso zesoya, kunye namantongomane athile kunye nembewu.