Bis-Stearyl Dimethicone

Benefits
Hair ConditioningSoftening

What is Bis-Stearyl Dimethicone?

Bis-Stearyl Dimethicone is a synthetic silicone polymer derived from dimethicone modified with stearyl alkyl chains, creating a branched structure for enhanced surface affinity. Commonly found in hair care products like conditioners and styling aids, as well as skin moisturizers and protective creams, it works by depositing a lightweight, flexible film on the skin or hair shaft. This coating reduces friction, improves slip during application, and helps lock in moisture while allowing breathability. Its stearyl modification boosts adhesion to hydrophobic surfaces, making it ideal for water-resistant formulations in sunscreens or long-wear makeup. In formulations, it enhances product spreadability and sensory feel without greasiness, contributing to smoother textures in leave-on treatments.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Film former
Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.
Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.

Benefits

Provides hair conditioning by smoothing the cuticle and reducing tangles.

Acts as an emollient to soften skin and improve texture.

Forms a film that aids moisture retention and enhances product performance.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals with dry or damaged hair seeking smoothness.
Those with rare silicone sensitivities.
People with rough skin wanting better hydration feel.
People preferring silicone-free formulations.
Users of styling products needing hold and shine.
Individuals experiencing buildup from heavy silicones in routine.

Safety Notes

  • Rated low hazard by EWG with scores of 1.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Bis-Stearyl Dimethicone

What is Bis-Stearyl Dimethicone used for?

It serves as a conditioning agent in hair and skin products, providing emollience and film formation.

Is it safe for daily use?

Yes, it has a low safety rating from EWG and shows no significant irritation concerns.

Does it cause acne?

No, its comedogenic rating is 0, making it suitable for acne-prone skin.