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U.S. Code of Federal Regula...
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Title 21-Food and Drugs
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CHAPTER I—FOOD AND DRUG ADM...
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PART 331—ANTACID PRODUCTS FOR OVER-THE-COUNTER ...
PART 331—ANTACID PRODUCTS FOR OVER-THE-COUNTER (OTC) HUMAN USE
§ 331.1 - Scope.
§ 331.10 - Antacid active ingredients.
§ 331.11 - Listing of specific active ingredients.
§ 331.15 - Combination with nonantacid active ingredients.
§ 331.20 - Determination of percent contribution of active ingredients.
§ 331.21 - Test modifications.
§ 331.30 - Labeling of antacid products.
§ 331.80 - Professional labeling.