Essential amino acid
AMINO ACID THAT CANNOT BE SYNTHESIZED DE NOVO BY THE ORGANISM
Essential aminoacid; Essential aminoacids; Essential amino acids; Complementary protein; Non-essential amino acid; Amino acid profile; Essential aa; Amino acids, essential; Limiting amino acid; Essential protein; Semi Essential amino acid; Conditionally essential amino acid
An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized from scratch by the organism fast enough to supply its demand, and must therefore come from the diet. Of the 21 amino acids common to all life forms, the nine amino acids humans cannot synthesize are phenylalanine, valine, threonine, tryptophan, methionine, leucine, isoleucine, lysine, and histidine.