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All answers having "Vitamin C source" as clue:

3 Character Answers:

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ADE



4 Character Answers:

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LIME



5 Character Answers:

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LIMES



6 Character Answers:

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CITRUS

ORANGE



7 Character Answers:

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LIMEADE

ROSEHIP



8 Character Answers:

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ROSEHIPS



11 Character Answers:

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ORANGEJUICE