Description_x000D_ Application_x000D_ L-Tryptophan has been used in PreC media preparation and in cell culture._x000D_ Packaging_x000D_ 1 kg in poly bottle_x000D_ 10 mg in glass bottle_x000D_ 25, 100 g in poly bottle_x000D_ Biochem/physiol Actions_x000D_ Tryptophan (Trp) is one of the functional amino acids that is associated with growth, reproduction, maintenance and immunity. Increased Trp availability is necessary for the regulation of mood, cognition and behaviour. It is hypothesised that L-Trp might be useful in inducing sleep in healthy adults against the normal circadian rhythm. Trp uptake by the brain depends on the plasma ratio of Trp to all of the other LNAAs (large neutral amino acids). Higher the Trp:LNAAs ratio, greater is the Trp uptake._x000D_ Other Notes_x000D_ Amino acid precursor of serotonin and melatonin