StacksVerified U.S. regulatory reference

21 CFR §556.765

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Acceptable daily intake (ADI). The ADI for total residue of zilpaterol is 0.083 µg/kg of body weight per day.
  2. (b)Tolerances. The tolerance for zilpaterol freebase (marker residue) is:
    1. (1)Cattle.
      1. (i)Liver (target tissue): 12 ppb.
      2. (ii)Muscle: 10 ppb.
    2. (2)[Reserved]
  3. (c)Related conditions of use. See § 558.665 of this chapter.