Snapshot
- Overview
- A hydrating polymer that keeps skin cushioned and comfortable.
- Category
- Hydration, Barrier Support, Sensitive Skin, Skin Conditioning
- Type
- Film Former
Polyquaternium-51
Polyquaternium-51 is a biomimetic, water-soluble phospholipid polymer that forms a moisture-retentive film. It boosts water retention and comfort, and makes formulas gentler, which is why it shows up often in hydrating and soothing products.
Like this ingredient?
Our take
Is Polyquaternium-51 a Good Ingredient?
Rated Great because biomimetic hydration performance has been supported by in vivo and in-use studies showing improved moisture retention with a gentle profile. It is stable in water-based formulas and is typically well tolerated, making it appealing for sensitive routines.
What it does
Skin Benefits
Provides a lasting hydration feel and helps skin feel cushioned, reducing sensations of tightness. Often well-tolerated, making it appealing for easily irritated skin.
Where you'll find it
Uses in Skincare & Cosmetics
Featured in hydrating serums, moisturizers, and sheet masks to boost moisture comfort. Also used in eye creams and after-sun gels for a dewy, soothing finish.
Before you use it
Safety
Typically well tolerated with a low likelihood of irritation, including for dry or reactive skin types. As with any ingredient, rare sensitivity can occur; discontinue if irritation appears. No widely recognized regulatory limits for standard cosmetic use.
Products with Polyquaternium-51
