Following Codex Alimentarius the EU agreed on gluten levels. According to the EU regulation 41/2009/EC, dietetic foods which contain one or more ingredients with gluten but which have been specifically processed to reduce the level of gluten to below 100 mg/kg shall bear the label "very low gluten" and the same products with a gluten level below 20 mg/kg may bear the label "gluten-free".
Further Information
COMMISSION REGULATION (EC) No 41/2009 of 20 January 2009
concerning the composition and labelling of foodstuffs suitable for people intolerant to gluten
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2009:016:0003:0005:EN:PDF
MoniQA Allergens Working Group
http://www.moniqa.org/allergens
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