• The L-Tryptophan amino acid is a precursor of melatonin
• The L-Tryptophan amino acid is a precursor of serotonin for 60 days

L-Tryptophane is a versatile essential amino acid that the body cannot produce, or can only produce in insufficient amounts. L-tryptophan is easy to replace with a balanced diet and good quality nutrients. Duck, pork, cottage cheese, and eggs are rich in L-tryptophan. If you want to cover your L-tryptophan intake from other sources as well, then you should take the BioTechUSA L-Tryptophan dietary supplement capsules. Thanks to its capsule form, it is easy to portion out and take with you anywhere during the day.