Tryptophan

An essential amino acid that is necessary for normal growth in infants and for nitrogen balance in adults. It is a precursor serotonin and niacin.

An amino acid well-known to foster drowsiness.

A major essential amino acid that is the precursor to serotonin.

An essential amino acid; the precursor of the neurotransmitter 5- hydroxytryptamine (serotonin) and of niacin.

An essential amino acid, it is a precursor of the important biochemical molecules: indoleacetic acid, serotonin, and nicotinic acid. L-Tryptophan is used as a common feed additive for livestock to ensure that their diet includes an adequate amount of this essential amino acid.

An essential amino acid used by the brain to produce serotonin.

Tryptophan is an essential aromatic amino acid needed for synthesis of the body’s proteins. It also serves other important roles in metabolism, including the synthesis of niacin as well as serotonin. Tryptophan and its metabolite 5-hydroxy- tryptophan have been marketed for their ergogenic potential due to their roles in serotonin production.

Amino acid essential for growth and normal metabolism. It is a precursor of niacin.

An amino acid that is a building block of niacin and serotonin. Tryptophan is important for maintaining normal levels of proteins and normal growth in infants. Good dietary sources include meats, poultry, fish, eggs, nuts, peanut butter, brewer’s yeast, and wheat germ.

An essential amino acid present in high concentrations in animal and fish protein. It is necessary for normal growth and development. Tryptophan is a precursor of serotonin and niacin. In high doses, it may cause nausea, vomiting, and sedation.

Amino acid that is converted into serotonin, a calming neurotransmitter in the brain.

A vital amino acid that must be obtained through dietary intake since the body is unable to synthesize it. Tryptophan undergoes conversion to niacin, one of the B vitamins, within the body.