Ingredient review
Dimethiconol Hydroxystearate
INCI: DIMETHICONOL HYDROXYSTEARATE
A gentle silicone derivative that improves product feel and spreadability, suitable for most skin types including sensitive skin.
In plain English
Dimethiconol Hydroxystearate is a hybrid ingredient that combines a silicone (dimethiconol) with a fatty acid (hydroxystearic acid). In simple terms, it helps your moisturizer or primer glide on smoothly, fills in fine lines temporarily for a blurring effect, and leaves a soft, non-greasy finish. It also helps blend oil and water ingredients together so the product stays stable.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Dimethiconol Hydroxystearate 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 Dimethiconol Hydroxystearate.
- 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 semi-synthetic silicone ester made by reacting dimethiconol (a silicone polymer) with hydroxystearic acid (a fatty acid derived from castor oil). It appears as a waxy solid or viscous liquid in formulas.
How it works
It sits on the surface of the skin or hair, forming a thin, breathable film that reduces friction (making products spread easily) and locks in moisture by slowing water loss. As an emulsifier, it helps mix water and oil phases so the product doesn't separate.
Pros
Silky, non-greasy feel
Unlike many oils and butters, this ingredient leaves a velvety finish that doesn't feel sticky or heavy, making it ideal for daytime moisturizers and primers.
Improves product stability
As an emulsifier, it helps keep water and oil ingredients mixed together, preventing your lotion or cream from separating over time.
Cons and cautions
Not biodegradable
Like many silicones, this ingredient does not break down easily in the environment, which may be a concern if you prioritize eco-friendly formulations.
May feel heavy for oily skin
In high concentrations, it can leave a slight film that some people with very oily or acne-prone skin find too occlusive.
Best for
- People with dry or normal skin who want a smooth, silky finish
- Anyone using makeup primers or tinted moisturizers for better blendability
Use caution if
- Those with extremely oily or clog-prone skin may prefer lighter, non-silicone alternatives
Usage tips
Safety summary
Dimethiconol Hydroxystearate has a low irritation and sensitization profile based on available safety data. It is considered safe for use in cosmetics at typical concentrations. However, as with any ingredient, individuals with very sensitive skin should patch test first.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that related silicone esters are safe in current usage patterns. Specific studies on Dimethiconol Hydroxystearate are limited, but its chemical structure suggests low skin penetration and low toxicity.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and many other regions. No concentration restrictions are specified for leave-on or rinse-off products.
- Common uses
- Moisturizers, Sunscreens, Makeup primers, Hair conditioners
- Environmental note
- This silicone derivative is not readily biodegradable and may accumulate in aquatic environments. Some brands are moving toward more biodegradable alternatives.
Good to know
- Dimethiconol Hydroxystearate is considered non-comedogenic in typical concentrations, but everyone's skin reacts differently—patch test if you are prone to breakouts.
- It is often used in 'blur' primers and BB creams to create a smooth canvas for makeup.
Common questions
What is Dimethiconol Hydroxystearate in beauty products?
Dimethiconol Hydroxystearate is a hybrid ingredient that combines a silicone (dimethiconol) with a fatty acid (hydroxystearic acid). In simple terms, it helps your moisturizer or primer glide on smoothly, fills in fine lines temporarily for a blurring effect, and leaves a soft, non-greasy finish. It also helps blend oil and water ingredients together so the product stays stable.
What does Dimethiconol Hydroxystearate do in a beauty product?
It sits on the surface of the skin or hair, forming a thin, breathable film that reduces friction (making products spread easily) and locks in moisture by slowing water loss. As an emulsifier, it helps mix water and oil phases so the product doesn't separate.
Is Dimethiconol Hydroxystearate safe for most people?
Dimethiconol Hydroxystearate has a low irritation and sensitization profile based on available safety data. It is considered safe for use in cosmetics at typical concentrations. However, as with any ingredient, individuals with very sensitive skin should patch test first.
Who should be careful with Dimethiconol Hydroxystearate?
Those with extremely oily or clog-prone skin may prefer lighter, non-silicone alternatives
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.