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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
All Titles
Title 21
Chapter I
Part 331 - PART 331—ANTACID PRODUCTS FOR OVER-THE-COUNTER (OTC) HUMAN USE
Subpart A [§ 331.1 - § 331.1] - Subpart A—General Provisions
Subpart B [§ 331.10 - § 331.15] - Subpart B—Active Ingredients
Subpart C [§ 331.20 - § 331.21] - Subpart C—Testing Procedures
Subpart D [§ 331.30 - § 331.80] - Subpart D—Labeling
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