“…5 It is authorised for use as a veterinary medical product without maximum residue limits. 6 The EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) published several opinions on the safety and efficacy of L-tryptophan produced by different strains of E. coli for all animal species (EFSA FEEDAP Panel, 2013, 2014a,b, 2015a,b, 2016a,b, 2017a,b, 2019a-e, 2020a. The EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) issued a scientific opinion on the substantiation of health claims related to L-tryptophan (EFSA NDA Panel, 2011).…”