Cerenity PM, includes 5-HTP, PharmaGABA®, and taurine, designed to boost levels of the neurotransmitters and hormones that promote relaxation prior to bedtime and increase the deep, restorative stages of sleep. It is crucial that the brain has optimal levels of serotonin and gamma-aminobutyric acid (GABA), the relaxing and sleep-regulating neurotransmitters, as well as the sleep-regulating hormone melatonin.