CFR›Title 21›Chapter I›Part 121›21 CFR Part 121 Subpart E Citation21 CFR Part 121 Subpart EContainsSection § 121.401CorpusDaily eCFRDisplayed edition2026-08-04Last updated2026-08-04 Subpart E—Compliance Sections § 121.401 § 121.401 Compliance. Authority21 U.S.C. 331, 342, 350g, 350(i), 371, 374.Source81 FR 34219, May 27, 2016, unless otherwise noted.