Polyglycerin-4

Polyglycerin-4 is a water-soluble oligomer of glycerin made of four linked units, used in cosmetic formulas as a humectant. It's chosen to attract moisture, support a supple feel, and stabilize light textures in everyday skincare.
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Ingredient Snapshot

Overview
A humectant that hydrates skin and eases the feeling of tightness.
Category
Hydration, Barrier Support, Skin Conditioning, Sensitive Skin
Type
Humectant

Ingredient Ratings

Overall Rating

Good

Comedogenic Risk

None

Skin Benefits

Helps maintain lasting hydration and reduces the feeling of tightness for softer, more comfortable skin. Contributes to a smoother, more supple surface.

Uses In Skincare & Cosmetics

Often included in serums, toners, and gel-cream moisturizers to improve spread and keep formulas feeling fresh. Also used in sheet mask essences for a hydrated finish.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

Generally considered low risk for irritation and suitable for sensitive skin, but any humectant can feel tight or prickly on very compromised barriers. Patch test if easily reactive and pair with occlusives to prevent transepidermal water loss in very dry climates.

Is Polyglycerin-4 a Good Ingredient?

Good rating because it reliably boosts hydration with low irritation and good formula stability, though there’s limited direct clinical evidence beyond established humectant performance. It helps reduce tack versus simple glycerin, making it a practical hydrator in lightweight systems.

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