Tryptophan is the starting material for auxin (indole-3-acetic acid), the primary plant growth hormone. Without tryptophan, plants cannot grow toward light or develop properly.

Amino acids, including tryptophan, are used as building blocks in protein biosynthesis, and proteins are required to sustain life. Tryptophan is among the less common amino acids found in proteins, but it plays important structural or functional roles whenever it occurs.

Tryptophan has two isomers: L-tryptophan and D-tryptophan. Milk and other dairy products are good sources of tryptophan, an essential amino acid important for mood, sleep patterns, and...

Tryptophan is a naturally occurring amino acid found in many foods. We explain what it does, how it impacts your health, and what to know about supplements.

Tryptophan is important to the functions of many organs in the body. When you consume tryptophan, your body absorbs it and changes it to eventually become a hormone called serotonin.

Overview: L-tryptophan is found in foods that contain protein and is also available over the counter as a dietary supplement. It is used for many different reasons, but its benefits are not well...

Tryptophan, an amino acid that is nutritionally important and occurs in small amounts in proteins. It is an essential amino acid, meaning that humans and certain other animals cannot synthesize it and must obtain it from their diets.

Foods high in tryptophan include soybeans, oat bran, and poultry. This amino acid is important for brain and immune functions and improves sleep quality.

Tryptophan is an essential amino acid needed for general growth and development, producing niacin, and creating serotonin in the body. High tryptophan foods include chicken, turkey, red meat, pork, tofu, fish, beans, milk, nuts, seeds, oatmeal, and eggs.

L-Tryptophan, an indispensable amino acid, serves as a precursor for several small molecules of functional significance including the vitamin niacin, the neurotransmitter serotonin, the metabolite tryptamine, and the pineal hormone melatonin.