History and Usage: 5 HTP is an herb that helps increase serotonin levels in the body. Websites for Further Research:

http://en.wikipedia.org/wiki/Amino_acid

http://www.biology.arizona.edu/biochemistry/p...

http://www.answers.com/topic/amino-acid#after_ad1

http://web.indstate.edu/thcme/mwking/aminoaci...