Polyquaternium-51

Polyquaternium-51 is a synthetic polymer that mimics the structure of phospholipids found in cell membranes. It forms a protective, invisible film on the skin, which helps to reduce water loss and improve hydration. This ingredient is known for its excellent moisturizing properties and ability to enhance skin comfort.

BenefitGood 2.8 / 4

Hydration i3.5 / 4

Whether the ingredient helps increase the skin’s water content — humectants that attract water, ingredients that reduce water loss, or ones that make skin feel less dry.

Barrier support i2.5 / 4

Whether it supports the skin barrier — restoring lipids, reducing water loss, aiding barrier repair, or strengthening the skin’s protective function.

Soothing i1.5 / 4

Whether it can calm the skin — linked to less redness, irritation, discomfort, or visible reactivity.

Texture i1 / 4

Whether it can improve smoothness and surface texture — roughness, flaking, clogged pores, or unevenness. Exfoliating acids, retinoids, and smoothing moisturizers may score here.

RiskVery low 0 / 4

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

• Improves skin hydration
• Forms a protective barrier
• Enhances skin comfort

Products with Polyquaternium-51

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Frequently asked questions

What is Polyquaternium-51?

Polyquaternium-51 is a synthetic polymer designed to mimic natural skin lipids, providing a protective and hydrating film on the skin's surface.

How does Polyquaternium-51 benefit the skin?

It helps to improve skin hydration by reducing transepidermal water loss and forms a barrier that enhances skin comfort and smoothness.