Our DL-Tryptophan is a high-quality dietary supplement manufactured in our own factory. Tryptophan is an essential amino acid that plays an important role in the synthesis of serotonin and melatonin, which are vital neurotransmitters that help regulate mood and sleep. Our DL-Tryptophan is derived from natural sources and undergoes strict quality control measures to ensure purity and potency. As a factory, we are committed to using only the best raw materials and the latest technology to produce innovative and effective nutritional supplements. Try our DL-Tryptophan today and experience the benefits of this essential amino acid for yourself!