Private Tim Hall wrote a report on the 9 essential amino acids that the human body cannot produce: isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The report lists the 9 essential amino acids and provides a website, www.tunaprotein.com/index.php?lay=show&ac=article, as a reference for more information on these important proteins.