Melatonin is a hormone that improves the quality of sleep and strengthens the immune system. Tryptophan with magnesium and vitamin B6, helps the production of this within the body. Tryptophan acts as precursor of serotonin, one involved neurotransmitter in regulating mood, stress and relaxation. L-Tryptophan is an essential amino acid, which means that our body can not produce by itself and should be adopted exogenously to the body. magnesium helps reduce tiredness and fatigue. amino acids are essential for many processes our metabolism