L-Tryptophan is a naturally occurring amino acid which is used to create Serotonin, the "feel good" neurotransmitter. It is a gentler and slower-acting Serotonin precursor compared to 5-HTP, making it a better choice for sustained and long-term use.
5-HTP is a powerful Serotonin supplement extracted from an African shrub called Griffonia simplicifolia. Research finds 5-HTP to improve mood rating by 35% and allieviate stress. (University of Groningen)