The 9 amino acids that make up the essential amino acid blend (Histidine, Iso-Leucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, Valine) are not synthesised by the body, so must all be sourced from the diet. The reason these 9 aminos are so important is that they assist with growth and tissue repair, immunity, blood cell manufacture and protects tissues against damage. A standard blend is available as well as bespoke ratios.