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, ...

Tryptophan is often dismissed as the reason for post-Thanksgiving fatigue, but its role in human health extends far beyond the holiday table. As an essential amino acid, tryptophan is crucial for ...

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 ...

5-hydroxytryptophan (5-HTP) is the precursor to the neurotransmitter serotonin. Side effects of 5-HTP can vary, but may include serotonin syndrome, gastrointestinal issues, heart and blood vessel ...