<P> An essential amino acid , or indispensable amino acid , is an amino acid that can not be synthesized de novo ( from scratch ) by the organism , and thus must be supplied in its diet . The nine amino acids humans can not synthesize are phenylalanine , valine , threonine , tryptophan , methionine , leucine , isoleucine , lysine , and histidine ( i.e. , FVTWMLIKH ) . </P>
<P> An essential amino acid , or indispensable amino acid , is an amino acid that can not be synthesized de novo ( from scratch ) by the organism , and thus must be supplied in its diet . The nine amino acids humans can not synthesize are phenylalanine , valine , threonine , tryptophan , methionine , leucine , isoleucine , lysine , and histidine ( i.e. , FVTWMLIKH ) . </P>
amino acids that you obtain from eating foods are classified as
amino acids that you obtain from eating foods are classified as
essential amino acid
essential amino acid