Innovative Nutrition With P5P and 5-HTP Hypoallergenic Dietary Supplement ZenMind Nighttime with P5P and 5-HTP ZenMind Nighttime includes the same amount of GABA and L-Theanine as the best-selling original formula ZenMind, augmented with vitamin B6 as P5P, and 5-HTP, the precursor to serotonin. The combination helps promote a relaxed state, and provides the necessary factors for the body to produce melatonin, supporting normal, health sleep.