21 CFR § 556.428
Narasin
June 25, 2020
(a) Acceptable daily intake (ADI). The ADI for total residue of narasin is 5 µg/kg of body weight per day.
(b) Tolerances. The tolerance for narasin (marker residue) is:
(1) Chickens. Abdominal fat (target tissue): 480 ppb.
(2) [Reserved]
(c) Related conditions of use. See §§558.363 and 558.364 of this chapter.