The Tryptophan in Food Regulations 1990
These Regulations prohibit the addition of tryptophan (an amino acid) to food intended for human consumption, and its consequent sale or supply (regulation 2(1) and (2)), subject to an exception for those who require the food on medical grounds (regulation 2(4)). These Regulations also prohibit the exposure for sale of food intended for human consumption containing added tryptophan (regulation 2(3)). Contravention of or failure to comply with these prohibitions is made an offence (regulation 2(5) and (6)).