If you have Immune disorder Histamine or problems with Allergy you must watch these You tube movies regarding mast cells
See this interesting article we extracted regarding Histamines which is related to Methylation from DR Jill also copy and paste this complete study on histamine below this line
http://ajcn.nutrition.org/content/85/5/1185.full.pdf
Dr Mercola has an interesting site as well
http://articles.mercola.com/sites/articles/archive/2013/04/18/allergy-season.aspx