Zilpaterol.
21 C.F.R. § 556.765
in effectEffective: 2024-07-01(a) Acceptable daily intake (ADI). The ADI for total residue of zilpaterol is 0.083 µg/kg of body weight per day.
(b) Tolerances. The tolerance for zilpaterol freebase (marker residue) is:
(1) Cattle. (i) Liver (target tissue): 12 ppb.
(ii) Muscle: 10 ppb.
(2) [Reserved]
(c) Related conditions of use. See § 558.665 of this chapter.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026
