L-Tryhtophan 98.35% is a necessary amino, which implies that the human body cannot synthesize it and can only acquire it from the diet or supplements. Compounds can be obtained from various food sources, although they are more easily derived directly from foods that have a high protein content or used as supplements for various health issues. L-Tryptophan is an essential amino acid that plays an important role in various biological processes. As a precursor to serotonin, a neurotransmitter that helps regulate mood, sleep, and appetite, and melatonin, a hormone that controls sleep-wake cycles, it is very important for humanity. L-Tryhtophan 98.35% is a highly purified form of the amino acid L-Tryptophan important for serotonin and melatonin production thus valuable for promoting mood, sleep, and stress levels.