For more information on Histamines look at some of theses sites:
http://www.wolframalpha.com/entities/chemical_molecular_weights/what_is_the_molecular_weight_of_histamine%3F/h9/uu/gk/
http://www.daviddarling.info/encyclopedia/H/histamine.html
http://www.goldbaum.net/balance/Whats_Histamine.html
http://www.nobelprize.org/nobel_prizes/medicine/laureates/1936/dale.jpg
http://en.wikipedia.org/wiki/Histamine
http://www.chm.bris.ac.uk/motm/histamine/jm/history.htm
http://www.ihealthtube.com/aspx/viewvideo.aspx?v=8b1c86dba00d078d
http://www.wolframalpha.com/entities/chemical_molecular_weights/what_is_the_molecular_weight_of_histamine%3F/h9/uu/gk/
http://www.daviddarling.info/encyclopedia/H/histamine.html
http://www.goldbaum.net/balance/Whats_Histamine.html
http://www.nobelprize.org/nobel_prizes/medicine/laureates/1936/dale.jpg
http://en.wikipedia.org/wiki/Histamine
http://www.chm.bris.ac.uk/motm/histamine/jm/history.htm
http://www.ihealthtube.com/aspx/viewvideo.aspx?v=8b1c86dba00d078d