Polyquaternium-7 is an ingredient that is a synthetic polymer based on quaternary ammonium compounds. It functions as an antistatic agent, film former, and hair fixative.
Bases that contain Polyquaternium-7
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Basic Essentials Shampoo Base

Color Protection Shampoo Base

Goat's Milk Hand Soap Base

PureEssence Sulfate Free Multi Application Base

Renew Amino Clarifying Shampoo Base
Sources
https://www.ewg.org/skindeep/ingredient/705124/POLYQUATERNIUM-7/