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