CFR›Title 21›Chapter I›Part 338›Subpart B ContainsSection 338.10CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart B—Active Ingredients Sections 338.10 § 338.10 Nighttime sleep-aid active ingredients. Previous A Subpart A—General Provisions Next C Subpart C—Labeling