Definition of Amino acid, essential
Amino acid, essential: An amino acid that cannot be made by humans and so is essential to the human diet. There are 9 essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012
Weight Loss Wisdom
Get tips, recipes and inspiration.