Polyquaterniums are commonly listed in cosmetic ingredient declarations in the form of “Polyquaternium-number,” such as Polyquaternium-7, Polyquaternium-10, Polyquaternium-22, Polyquaternium-37, and Polyquaternium-55. In the industry, PQ is often used as the abbreviation for Polyquaternium.
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