Serotonin is useless guys.... Serotonin converts to melatonin in the brain and melatonin makes you calm/relaxed so its good for sleeping but just overall reducing stress... so just supplement with melatonin instead which will benefit you more and not come with any side effects you get from 5-htp if you do..Serotonin alone does not do much . If you have a good or even average diet you should be getting enough Serotonin anyway so just supplementing it with more is waste of time. You know how many things(FOOD) you take into your body contains tryptophan(serotonin another name) ? Too many.. unless you have a genetic mutation that breaks down serotonin fast or something you shouldnt be supplementing.. even then I dont think you should IMO serotonin = USELESS.
All the food that goes into your body the toxic/bad stuff in the gut gets converted to serotonin.