Narasin.
21 C.F.R. § 556.428
in effectEffective: 2024-07-01(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.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026
