Pure, botanical-source of 5-HTP. Boost production of serotonin & melatonin. Magnesium & vitamins B3, B6 & B12 support the nervous system & psychological function. 5-HTP is an amino acid that is naturally found in our bodies, where it is converted into serotonin & melatonn, natural neurotransmitters that influence a variety of functions, including sleep, appetite & mood. Healthspan's Night Time 5-HTP is a unique synergistic combination of five naturally helpful nutrients, formulated by experts for maximum benefit. Healthspan make their tablets with natural source 5 HTP, carefully extracted from the seeds of the West African tree Griffonia simplicifolia. &, also, added B vitamins & magnesium to provide extra support to our nervous system & psychological function.