Essential amino acids
Essential amino acids - amino acids whose presence and optimal ratio determine the biological value of protein; these include 8 amino acids: valine, isoleucine, leucine, lysine, methionine, tryptophan, threonine, phenylalanine
Source: "METHODICAL RECOMMENDATIONS 'HYGIENIC ASSESSMENT OF NUTRITION RATIONS FOR STUDENTS (PUPILS)'
(approved by the head of the Moscow Department of Rosconsumnadzor and director of the Institute of Hygiene of Children and Adolescents, Federal Research Center for Health Protection of the Russian Academy of Medical Sciences on 25.02.2008)