Ingredient review
Butyl Stearate
INCI: Butyl Stearate
Butyl Stearate is a lightweight emollient that helps products glide on smoothly, but it may clog pores for acne-prone skin.
In plain English
Butyl Stearate is an ingredient made from stearic acid (a fatty acid found in plants and animals) and butyl alcohol. It feels light and silky on the skin, helping creams and lotions spread easily without leaving a greasy residue. Think of it as a smoothing agent that makes your moisturizer feel nicer to apply.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is low; clogging risk is moderate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- moderate
Quick decision guide
Useful, but context matters
Butyl Stearate can be useful, but watch for possible clogging concerns.
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 Butyl Stearate.
- 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
moderateMay be fine for many users but deserves caution if you are breakout-prone.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Butyl Stearate is a synthetic ester created by combining stearic acid with butanol. It is a clear, oily liquid that is widely used in cosmetics for its emollient and lubricating properties.
How it works
In a cosmetic product, Butyl Stearate sits on the skin's surface to soften and smooth the outer layer. It reduces friction, making products easier to apply, and helps other ingredients spread evenly. It also acts as a solvent for some active ingredients and can improve the texture of creams and lotions.
Pros
Lightweight feel
Butyl Stearate provides a silky, non-greasy texture that makes creams and lotions feel pleasant on the skin.
Improves product performance
It helps other ingredients spread evenly and can enhance the overall sensory experience of a product.
Cons and cautions
May clog pores
With a moderate comedogenic rating, it can contribute to breakouts in acne-prone individuals, especially when used in high concentrations.
Synthetic origin
As a lab-created ingredient, it may not appeal to those seeking exclusively natural or plant-based formulations.
Best for
- People with normal to dry skin looking for a lightweight emollient
- Those who enjoy a silky, smooth texture in their moisturizers
Use caution if
- Individuals with acne-prone or very oily skin who are sensitive to pore-clogging ingredients
Usage tips
Safety summary
Butyl Stearate is generally safe for most skin types at typical cosmetic concentrations. The main concern is its moderate comedogenic potential, which may cause breakouts in acne-prone individuals. It is not a known irritant or sensitizer.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that Butyl Stearate is safe for use in cosmetics at current levels. Studies show low acute toxicity and no significant skin irritation or sensitization in animal and human tests.
Common label clues
- Typical concentration
- 1–10%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with no concentration restrictions in leave-on or rinse-off products.
- Common uses
- Moisturizers, Makeup removers, Sunscreens, Lip products
- Environmental note
- Butyl Stearate is biodegradable and does not bioaccumulate significantly, making it relatively low-risk for aquatic ecosystems.
Good to know
- Butyl Stearate is also used in industrial lubricants and plastics, but cosmetic-grade versions are purified for skin safety.
- It is biodegradable and not considered a major environmental concern in typical cosmetic concentrations.
Common questions
What is Butyl Stearate in beauty products?
Butyl Stearate is an ingredient made from stearic acid (a fatty acid found in plants and animals) and butyl alcohol. It feels light and silky on the skin, helping creams and lotions spread easily without leaving a greasy residue. Think of it as a smoothing agent that makes your moisturizer feel nicer to apply.
What does Butyl Stearate do in a beauty product?
In a cosmetic product, Butyl Stearate sits on the skin's surface to soften and smooth the outer layer. It reduces friction, making products easier to apply, and helps other ingredients spread evenly. It also acts as a solvent for some active ingredients and can improve the texture of creams and lotions.
Is Butyl Stearate safe for most people?
Butyl Stearate is generally safe for most skin types at typical cosmetic concentrations. The main concern is its moderate comedogenic potential, which may cause breakouts in acne-prone individuals. It is not a known irritant or sensitizer.
Who should be careful with Butyl Stearate?
Individuals with acne-prone or very oily skin who are sensitive to pore-clogging ingredients
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.