what is tryptophan used for in the body?
<answer> Tryptophan is an essential amino acid that acts like a natural mood regulator, since it has the ability to help the body produce and balance certain hormones naturally. <context> Tryptophan (also called L-tryprophan) is an essential amino acid that acts like a natural mood regulator, since it has the ability to help the body produce and balance certain hormones naturally.