Progesterone.
21 C.F.R. § 556.540
in effectEffective: 2024-07-01(a) [Reserved]
(b) Residues. Residues of progesterone are not permitted in excess of the following increments above the concentrations of progesterone naturally present in untreated animals:
(1) Cattle and sheep. (i) Muscle: 5 ppb.
(ii) Liver: 15 ppb.
(iii) Kidney: 30 ppb.
(iv) Fat: 30 ppb.
(2) [Reserved]
(c) Related conditions of use. See §§ 522.1940 and 529.1940 of this chapter.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026