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In page Orange juice:

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Because such processes remove the distinct aroma compounds that give orange juice a fresh-squeezed taste, producers later add back these compounds in a proprietary mixture, called a "flavor pack", in order to improve the taste and to ensure a consistent year-round taste.[2][4] The compounds in the flavor packs are derived from orange peels.[4] Producers do not mention the addition of flavor packs on the label of the orange juice.[4]