CFR›Title 21›Chapter I›Part 589 ContainsSubparts A–BCorpusDaily eCFRDisplayed edition2026-05-13Last updated2026-05-13 PART 589—SUBSTANCES PROHIBITED FROM USE IN ANIMAL FOOD OR FEED Subparts A Subpart A—General Provisions Section 589.1 B Subpart B—Listing of Specific Substances Prohibited From Use in Animal Food or Feed Sections 589.1000–589.2001 Authority21 U.S.C. 321, 342, 343, 348, 371. Previous 584 Part 584—Food Substances Affirmed as Generally Recognized as Safe in Feed and Drinking Water of Animals Next 600 Part 600—Biological Products: General