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The poison ivy plant itself is not what makes people itch. It's an oil called urushiol, which is inside the leaves, stems and roots of the plants. That's why some of the sources I quote below use t...
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The poison ivy plant itself is not what makes people itch. It's an oil called urushiol, which is inside the leaves, stems and roots of the plants. That's why some of the sources I quote below use t...