Tryptophan, an essential amino acid, is the largest of the amino acids. It is also a derivative of alanine, having an indole substituent on the β carbon. The indole functional group absorbs strongly in the near ultraviolet part of the spectrum. The indole nitrogen can hydrogen bond donate, and as a result, tryptophan, or at least the nitrogen, is often in contact with solvent in folded proteins. Amino acids help to create proteins that aid in neurotransmission messages to and from the brain. Tryptophan is an essential amino acid that plays a vital role in this process. Tryptophan is a precursor of 5-HTP or serotonin which is acquired from dietary sources. Tryptophan combines with vitamin B6, transforming into serotonin and niacin in the liver. This helps to improve blood circulation, enhance memory and lower cholesterol, making tryptophan an essential amino acid to improve your overall health. The L-tryptophan in food is bound in protein rather than free form. For ever...