Tryptophan derivatives are compounds that are formed from the amino acid tryptophan, which is essential for protein synthesis and serves as a precursor for several important biomolecules. These derivatives include serotonin, a neurotransmitter that regulates mood, and melatonin, which is involved in sleep regulation. These compounds play crucial roles in various biological processes. For instance, serotonin influences mood and behavior, while melatonin helps control the sleep-wake cycle. Additionally, tryptophan derivatives can also impact immune function and gastrointestinal health, highlighting their significance in overall well-being.