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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
All Titles
Title 21
Chapter I
Part 331
Subpart B - Subpart B—Active Ingredients
§ 331.10 - Antacid active ingredients.
§ 331.11 - Listing of specific active ingredients.
§ 331.15 - Combination with nonantacid active ingredients.
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