Melatonin exists naturally in the human body and is involved in setting mammalian circadian rhythms. Our Sleep Support with Melatonin contains two B vitamins which play roles in the production of adrenal hormones and essential neurotransmitters that regulate sleep patterns. Magnesium aids in calming nerves and relaxing the muscles, GABA is an amino acid that supports an over-exvited brain, and L-Theanine supports the brain's production of relaxing alpha waves, further supported by calming chamomole flowers.