Polyquaternium-10 (PQ-10) is a quaternized, water-soluble cellulose ether engineered to deposit on negatively charged keratin surfaces. In skincare cleansers and body washes, its cationic charge provides high substantivity to the stratum corneum, forming a breathable, uniform film that decreases surfactant-induced protein/lipid extraction. This translates into improved rinse-off mildness (less tightness after washing), better moisture retention via reduced transepidermal water loss, and a smoother, conditioned feel on wet and dry skin. PQ-10 also optimizes rheology/foam quality in anionic surfactant systems, enhancing creaminess and cushion without destabilizing typical preservative systems or fragrances.

In haircare, PQ-10 excels as a deposition aid and anti-static conditioner across shampoos, 2-in-1s, co-washes, and rinse-off/leave-in treatments. Electrostatic attraction drives uniform polymer lay-down along damaged cuticles, lowering wet and dry combing forces, limiting fiber-to-fiber friction, reducing flyaways, and supporting style retention. The deposited film synergizes with silicones and oils, improving shine and tactile softness while helping to control frizz in humid conditions. Multiple molecular-weight grades allow fine-tuning between slip, detangling, and body — enabling targeted sensorials from “weightless” daily care to richer, repair-leaning systems.