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, ...

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 ...

Tryptophan is one of nine essential amino acids that's essential to a healthy diet and is found in foods like chicken, turkey, eggs, peanuts, and dairy. Your body uses tryptophan to make melatonin and ...