essential amino acids



  • Amino acids which are necessary for health and cannot be synthesized in the body and must therefore be obtained from food. They are: isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine, plus histidine which is required by growing infants and may be required by adults.


  • plural noun the eight amino acids that are essential for growth but cannot be synthesised and so must be obtained from food or medicinal substances