U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 28, 2025

All TitlesTitle 21Chapter IPart 500Subpart B - Subpart B—Specific Administrative Rulings and Decisions
§ 500.23 - Thermally processed low-acid foods packaged in hermetically sealed containers.
§ 500.24 - Emergency permit control.
§ 500.25 - Anthelmintic drugs for use in animals.
§ 500.26 - Timed-release dosage form drugs.
§ 500.27 - Methylene blue-containing drugs for use in animals.
§ 500.29 - Gentian violet for use in animal feed.
§ 500.30 - Gentian violet for animal drug use.
§ 500.45 - Use of polychlorinated biphenyls (PCB's) in the production, handling, and storage of animal feed.
§ 500.46 - Hexachlorophene in animal drugs.
§ 500.50 - Propylene glycol in or on cat food.
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