CFR › Title 21 › Part 335 › §335.1021 CFR §335.10Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkThe active ingredient of the product consists of any one of the following when used within the dosage limits established for each ingredient in § 335.50(d):(a)Bismuth subsalicylate.(b)Kaolin.