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The Growth elixir was a concoction made by Phineas and Ferb to make Baljeet's watermelon grow bigger but Candace used it to make herself two inches taller. This would backfire on her, as the elixir eventually made her 50 feet tall. Phineas mentioned that the elixir only works once, however, he used again to make their Aqua Primates grow. ("Attack of the 50 Foot Sister", "Phineas and Ferb Hawaiian Vacation")

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