Dietary supplement based on tryptophan, suitable as a mood regulator, is a precursor of serotonin. Tryptophan is an essential amino acid for the production and maintenance of proteins, muscles, enzymes and neurotransmitters in the body. It is an essential amino acid which means that the body cannot produce it, so it must be obtained from food. It helps to sleep satisfactorily at night and maintain regularity of sleep-wake cycles. Contributes to maintaining a stable mood, with less risk of suffering episodes of stress.