<<Disclaimer: Verify this information before applying it to your situation.>>

A double-blind random study involving 49 CD patients, GF for at least 2 
years, was conducted giving participants capsules containing 0mg, 10mg or 
50mg gluten daily for 90 days determined, "The ingestion of contaminating 
gluten should be kept lower than 50 mg/d in the treatment of CD."

American Journal of Clinical Nutrition, Vol. 85, No. 1, 160-166, January 
2007
A prospective, double-blind, placebo-controlled trial to establish a safe 
gluten threshold for patients with celiac disease 
Carlo Catassi, Elisabetta Fabiani, Giuseppe Iacono, Cinzia D'Agate, 
Ruggiero Francavilla, Federico Biagi, Umberto Volta, Salvatore Accomando, 
Antonio Picarelli, Italo De Vitis, Giovanna Pianelli, Rosaria Gesuita, 
Flavia Carle, Alessandra Mandolesi, Italo Bearzi and Alessio Fasano 

< http://www.ajcn.org/cgi/content/abstract/85/1/160 >

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