This food supplement contains 5-HTP, the safe precursor to serotonin. It also contains the nutrients necessary for the conversion of 5-HTP to serotonin. Made from the shrub Griffonia, with added magnesium and vitamin B6 5-HTP Plus contains 5-HTP from the shrub Griffonia 5-HTP is the safe precursor to serotonin - this supplement also contains the other nutrients necessary for the conversion of 5-HTP to serotonin - magnesium and vitamin B6 Magnesium is involved in many essential metabolic processes and contributes to the reduction of tiredness and fatigue, normal psychological function, normal energy-yielding metabolism and the normal functioning of the nervous system Vitamin B6 contributes to the normal function of the nervous system, psychological function, the regulation of hormonal activity and the reduction of tiredness and fatigue.