Ingredient review
Steareth-11
INCI: STEARETH-11
Steareth-11 is a gentle synthetic emulsifier that helps create stable, creamy textures in skincare, but may be less suitable for those avoiding ethoxylated ingredients.
In plain English
Steareth-11 is a man-made ingredient that helps water and oil mix together in products like lotions and creams. It's made from a fatty alcohol (stearyl alcohol) that has been reacted with ethylene oxide. This process creates a molecule that can hold onto both water and oil, giving your moisturizer a smooth, even texture. It's generally considered mild and non-irritating for most skin types.
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
Steareth-11 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 Steareth-11.
- 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
Steareth-11 is a polyethylene glycol (PEG) ether of stearyl alcohol, containing an average of 11 ethylene oxide units. It belongs to the steareth family of emulsifiers, which are widely used in cosmetics to stabilize oil-in-water emulsions.
How it works
Steareth-11 works by reducing the surface tension between oil and water, allowing them to blend into a stable, uniform emulsion. Its hydrophilic (water-loving) head and lipophilic (oil-loving) tail enable it to surround oil droplets and suspend them in water, preventing separation. This results in a creamy, spreadable product that delivers both water-soluble and oil-soluble ingredients to the skin.
Pros
Gentle emulsifier
Steareth-11 is considered low-irritation and non-comedogenic, making it suitable for most skin types, including sensitive skin.
Improves product texture
It helps create a smooth, creamy consistency that spreads easily and feels pleasant on the skin, enhancing the user experience.
Cons and cautions
Ethoxylation concerns
As an ethoxylated ingredient, trace amounts of 1,4-dioxane (a potential contaminant) can form during manufacturing. Reputable brands purify their ingredients to meet safety limits.
Not natural
Steareth-11 is fully synthetic, which may not appeal to consumers seeking plant-based or naturally derived skincare alternatives.
Best for
- People with normal to dry skin who enjoy rich, creamy moisturizers
- Anyone looking for a stable, well-formulated lotion or cream
Use caution if
- Individuals who prefer to avoid ethoxylated ingredients or PEG compounds
Usage tips
Safety summary
Steareth-11 is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet strict safety limits. It has low irritation and comedogenic potential.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated steareth compounds and concluded they are safe in cosmetic formulations. Studies show low acute toxicity and minimal skin irritation. No significant human or animal data suggest health risks at typical exposure levels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the U.S. FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has reviewed steareth compounds and found them safe as used in rinse-off and leave-on products.
- Common uses
- Moisturizers, Cleansers, Lotions, Creams, Hair conditioners
- Environmental note
- Steareth-11 is synthetic and derived from petrochemicals. It is not readily biodegradable, so its environmental persistence is a consideration for eco-conscious consumers.
Good to know
- Steareth-11 is often part of a blend with other steareth compounds (e.g., Steareth-2, Steareth-21) to fine-tune emulsion stability.
- The number '11' refers to the average number of ethylene oxide units, which influences its water solubility and emulsifying strength.
Common questions
What is Steareth-11 in beauty products?
Steareth-11 is a man-made ingredient that helps water and oil mix together in products like lotions and creams. It's made from a fatty alcohol (stearyl alcohol) that has been reacted with ethylene oxide. This process creates a molecule that can hold onto both water and oil, giving your moisturizer a smooth, even texture. It's generally considered mild and non-irritating for most skin types.
What does Steareth-11 do in a beauty product?
Steareth-11 works by reducing the surface tension between oil and water, allowing them to blend into a stable, uniform emulsion. Its hydrophilic (water-loving) head and lipophilic (oil-loving) tail enable it to surround oil droplets and suspend them in water, preventing separation. This results in a creamy, spreadable product that delivers both water-soluble and oil-soluble ingredients to the skin.
Is Steareth-11 safe for most people?
Steareth-11 is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet strict safety limits. It has low irritation and comedogenic potential.
Who should be careful with Steareth-11?
Individuals who prefer to avoid ethoxylated ingredients or PEG compounds
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.