21 C.F.R. § 170.245

Part 5 of a GRAS notice: Experience based on common use in food before 1958

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If the statutory basis for your conclusion of GRAS status is through experience based on common use in food, in Part 5 of your GRAS notice you must include evidence of a substantial history of consumption of the notified substance for food use by a significant number of consumers prior to January 1, 1958.