5-HTP (5-Hydroxytryptophan) is a drug-free and naturally occurring plant-derived amino acid that participates in the body’s synthesis of serotonin, the chemical messenger that plays a key role in enhancing mood. Natrol 5-HTP, is the #1 5-HTP brand in America, and promotes a calm and relaxed mood while helping you maintain a positive outlook. Natrol 5-HTP Time Release gradually releases 5-HTP to help you throughout the day. Promotes a calm and relaxed mood. Helps maintain a positive outlook. Enables production of serotonin. Controlled release formula. 100% drug-free. Non-habit forming. 100% Vegetarian. Regular use of Natrol 5-HTP Time Release can help provide a more positive and balanced attitude needed to help you maintain a healthy outlook. Today is a good day to have a good day. Go ahead and uplift your mood with Natrol 5-HTP Time Release.