CFR›Title 21›Chapter I›Part 589›21 CFR Part 589 Subpart A Citation21 CFR Part 589 Subpart AContainsSection § 589.1CorpusDaily eCFRDisplayed edition2026-10-21Last updated2026-10-21 Subpart A—General Provisions Sections § 589.1 § 589.1 Substances prohibited from use in animal food or feed. Authority21 U.S.C. 321, 342, 343, 348, 371.