Natrol 5-HTP Fast Dissolve is a 100% drug-free and naturally occurring plant-derived amino acid that participates in the body?s synthesis of serotonin.? Serotonin is the chemical messenger that plays a key role in enhancing mood.? Regular use of Natrol 5-HTP helps provide a more positive outlook and promotes calmness.? Natrol 5-HTP Fast Dissolve is more bio-available than other 5-HTP tablets to help you quickly when you need it most.? It tastes great and can be taken anytime anywhere. No water needed.?