Silicone

PEG-17 Dimethicone

INCI: PEG-17 DIMETHICONE

Reviewed by Daisy · Last updated 2 Jun 2026

Also known as: Peg-17 Dimethicone

A silicone-based conditioning agent that smooths and protects the skin and hair surface

Best For Skin Types

All, Dry, Combination, Sensitive

Addresses

Dryness, Rough texture, Barrier repair

Usage Frequency

Daily

What Is PEG-17 Dimethicone?

PEG-17 Dimethicone is a silicone polymer that combines silicone with polyethylene glycol (PEG) chains. This hybrid structure makes it water-dispersible, unlike many traditional silicones, allowing it to blend more easily into formulations without leaving a greasy residue.

In skincare and haircare products, it functions as a conditioning and protective agent. It deposits a light film on the skin or hair surface that can help smooth the texture and create a soft feel whilst providing some protective benefits against environmental factors.

How It Works

PEG-17 Dimethicone works by depositing a thin, occlusive layer on the skin surface. The silicone backbone provides the conditioning and protective properties, whilst the PEG component allows the ingredient to disperse in water-based formulations rather than sitting on top like traditional silicones.

This creates a mild barrier effect that can help reduce transepidermal water loss and smooth irregularities on the skin surface, though the effect is typically subtle and temporary.

Clinical Evidence & References

Published clinical research specifically on PEG-17 Dimethicone in skincare is limited. However, silicone polymers as a class have a long safety history in cosmetics and are generally recognised as non-irritating conditioning agents that improve the sensory profile of products.

The ingredient is accepted across major regulatory bodies including the FDA and European Commission for cosmetic use. Its water-dispersible nature may offer advantages over traditional silicones in terms of formulation flexibility, though direct comparative efficacy studies are sparse.

How to Use

PEG-17 Dimethicone is typically encountered as a minor ingredient in formulations rather than a standalone active, so usage frequency and application method depend on the specific product. Use as directed on the product label. There is no evidence that frequent use causes problems, and it integrates well into both morning and evening routines across most formulation types.

Safety & Precautions

PEG-17 Dimethicone is well-tolerated and considered safe for cosmetic use across all major regulatory frameworks. It is non-comedogenic at typical use concentrations and suitable for sensitive skin, though individual responses to silicones can vary.

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