The amino acids 5-hydroxytryptophan (5-HTP) and l-tryptophan are precursors of serotonin. 5-HTP is generally recommended over l-tryptophan because it crosses the blood-brain barrier at a higher rate, ...

Delicious tips from the emerging field of nutritional psychology.

Tryptophan is an essential amino acid—meaning it must be obtained from diet—that is found in many proteins. Tryptophan is necessary to help build many peptides and proteins in the body, supporting ...

Which tryptophan supplement is best? Tryptophan is an essential amino acid that’s naturally found in foods such as eggs, tofu and poultry. It plays an important role in the production of serotonin and ...