--- http://www.has-sante.fr/portail/display.jsp?id=c_400528 http://www.has-sante.fr/portail/upload/docs/application/pdf/ct032105.pdf 2005 France French administration, oral betaine drug combinations treatment outcome N-acetylmethionine sorbitol methionine dyspepsia constipation drugs for bile therapy and lipotropics in combination evaluation of the transparency committee