21 C.F.R. § 172.575

Quinine

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Quinine, as the hydrochloride salt or sulfate salt, may be safely used in food in accordance with the following conditions:

UsesLimitations
In carbonated beverages as a flavorNot to exceed 83 parts per million, as quinine. Label shall bear a prominent declaration of the presence of quinine either by the use of the word “quinine” in the name of the article or through a separate declaration.