Ingredient review
Bis-Stearyl Dimethicone
INCI: Bis-Stearyl Dimethicone
A gentle silicone that gives a silky, smooth feel to products without clogging pores or causing irritation.
In plain English
Bis-Stearyl Dimethicone is a type of silicone that sits on top of your skin to create a smooth, velvety finish. It helps other ingredients spread evenly and can make your skin feel soft without being greasy. Because it forms a light film, it also helps lock in moisture and can improve the wear of makeup. It is considered very gentle and unlikely to cause breakouts or irritation.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Bis-Stearyl Dimethicone is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Bis-Stearyl Dimethicone.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic silicone polymer made by attaching stearyl alcohol (a fatty alcohol from plant sources) to a dimethicone backbone. This gives it both water-repelling and skin-conditioning properties.
How it works
It spreads easily over the skin, forming a thin, breathable film that reduces water loss (transepidermal water loss, or TEWL) while providing a smooth, non-greasy feel. It also helps other ingredients like pigments or active ingredients spread more evenly.
Pros
Silky, smooth texture
Creates a velvety feel on the skin without being heavy or sticky, making it ideal for primers and moisturizers.
Low irritation potential
Rated as very low risk for irritation and comedogenicity, so it is generally safe for sensitive and acne-prone skin.
Cons and cautions
Not biodegradable
As a synthetic silicone, it does not break down easily in the environment, which may be a concern for eco-conscious users.
May require double cleansing
Because it forms a film, it can be resistant to water-based cleansers, so an oil-based cleanser or micellar water may be needed for thorough removal.
Best for
- People with normal to dry skin who want a smooth, soft finish
- Anyone looking for a lightweight, non-greasy moisturizer or primer ingredient
Use caution if
- Those who strictly avoid silicones in their skincare routine
Usage tips
Safety summary
Bis-Stearyl Dimethicone is considered very safe for topical use. It has low irritation and comedogenic potential, and no significant safety concerns have been identified in cosmetic concentrations.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed dimethicone and related silicones and found them safe as used in cosmetics. Individual studies on Bis-Stearyl Dimethicone specifically are limited, but its chemical relatives are well-studied and considered non-irritating.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics worldwide, including the EU, US, and Japan, with no known restrictions at typical concentrations.
- Common uses
- Moisturizers, Primers, Sunscreens, Foundations, Hair conditioners
- Environmental note
- Silicones like this one are not readily biodegradable and can accumulate in the environment. Some manufacturers are working on more eco-friendly alternatives.
Good to know
- Bis-Stearyl Dimethicone is often used in combination with other silicones to achieve different textures.
- It is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels.
Common questions
What is Bis-Stearyl Dimethicone in beauty products?
Bis-Stearyl Dimethicone is a type of silicone that sits on top of your skin to create a smooth, velvety finish. It helps other ingredients spread evenly and can make your skin feel soft without being greasy. Because it forms a light film, it also helps lock in moisture and can improve the wear of makeup. It is considered very gentle and unlikely to cause breakouts or irritation.
What does Bis-Stearyl Dimethicone do in a beauty product?
It spreads easily over the skin, forming a thin, breathable film that reduces water loss (transepidermal water loss, or TEWL) while providing a smooth, non-greasy feel. It also helps other ingredients like pigments or active ingredients spread more evenly.
Is Bis-Stearyl Dimethicone safe for most people?
Bis-Stearyl Dimethicone is considered very safe for topical use. It has low irritation and comedogenic potential, and no significant safety concerns have been identified in cosmetic concentrations.
Who should be careful with Bis-Stearyl Dimethicone?
Those who strictly avoid silicones in their skincare routine
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.