5-HTP is a naturally occurring amino acid and is a precursor to the neurotransmitter serotonin. Serotonin is known to provide a feeling of serenity and is released into the body to provide the pleasant and relaxed feeling experienced after a satisfying meal. Serotonin boosters are the building blocks for most of today's mood enhancement drugs, however, the use of 5-HTP as a dietary supplement is non-habit forming and perfectly safe. 5-HTP is also useful as a natural appetite suppressant.