Regulation 1 Citation and commencementI1 Northern Ireland These Regulations may be cited as the Tryptophan in Food Regulations (Northern Ireland) 2005 and shall come into operation on 11th November 2005. Annotations Commencement I1 Reg. 1 in operation at 11.11.2005, see reg. 1 ← Introduction Regulation 1 Regulation 2 →