CFR›Title 9›Chapter III›Part 424›Subpart C ContainsSections 424.21–424.23CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart C—Food Ingredients and Sources of Radiation Sections 424.21 § 424.21 Use of food ingredients and sources of radiation. 424.22 § 424.22 Certain other permitted uses. 424.23 § 424.23 Prohibited uses. Previous A Subpart A—General