Care2.com had an article titled “A better way to Improve Mood“. Here are a couple of interesting article highlights:
““We’re facing a bad-mood epidemic”
“Of course, neither amino acids nor antidepressants work for everyone, but a 1991 head-to-head comparison published in the medical journalPsychopathology found that the amino acid 5-hydroxytryptophan (5-HTP) actually outperformed the antidepressant Luvox in [...]

The naturally occurring amino acid 5-HTP can be extracted from the Griffonia simplicifolia plant.
5-HTP has been associated with the increased production of the neurotransmitter serotonin. Serotonin and other neurotransmitters are responsible for proper nerve functioning and decreased levels have been associated with depression, anxiety, and excess anger.