{"topic_id":"FDA_CFR21_part501_labeling","category":"fda","context":"---\ntopic_id: \"FDA_CFR21_part501_labeling\"\ncategory: \"fda\"\ntitle: \"FDA CFR21 part501 labeling\"\nlang: en\nsource_document: \"U.S. FDA / CVM — 21 CFR Part 501\"\ncitation:\n  authority: \"fda\"\n  title: \"FDA CFR21 part501 labeling\"\n  url: \"https://www.ecfr.gov/current/title-21/part-501\"\n  retrieved: \"\"\n  ref: \"21 CFR Part 501\"\n  doc_type: \"official web page\"\n  needs_review: false\nauthority_tier: T1\nauthority_tier_basis: \"T1:fda\"\nauthority_tier_date: 2026-08-04\n---\n21 CFR Part 501 (revised 2024 modernization) sets FDA's labeling standards for pet food. Required Principal Display Panel elements: (1) statement of identity (product name with species designation); (2) net quantity statement in dual units (oz + g, lbs + kg); (3) name and place of business of manufacturer/packer/distributor. Required information panel elements: (1) ingredients list in descending order by weight (as fed basis); (2) guaranteed analysis: crude protein min%, crude fat min%, crude fiber max%, moisture max%, ash max% (if claimed); (3) nutritional adequacy statement (AAFCO protocol); (4) feeding directions (with daily caloric content for the recommended portion); (5) best before date + lot number. The 2024 modernization added: (a) mandatory 'human grade' claim must meet 21 CFR 110 human food cGMP for entire production chain; (b) functional claims require 'competent and reliable scientific evidence' substantiation.\n","sources":["fda — FDA CFR21 part501 labeling"],"source":{"authority":"fda","title":"FDA CFR21 part501 labeling","url":"https://www.ecfr.gov/current/title-21/part-501","retrieved":"","ref":"","doc_type":"official source","source_document":"U.S. FDA / CVM — 21 CFR Part 501","verification_file":""},"source_document":"U.S. FDA / CVM — 21 CFR Part 501","source_file":"","trust":{"authority_tier":"T1","fidelity":"verbatim","license":null,"display_grade":"A"},"tokens_estimated":178,"generated_at":"2026-07-16","tip":"Use /api/v1/topics to discover more topics. /api/v1/nutrient for precise single-point queries. /api/v1/cross_compare for 2-3 standard comparisons."}