Amino acids are used by the body to build proteins proteins are essential for the formation of cells and are also involved in the biochemical structure of hormones enzymes neurotransmitters and antibodies the neurotransmitter histamine which is released during allergic reactions such as hayfever is derived from the amino acid histidine histidine is also necessary for the maintenance of the myelin sheath of nerves as with all our amino acids lamberts l histidine is presented in i