Ingredient review
Steareth-4 Stearate
INCI: Steareth-4 Stearate
A gentle synthetic emulsifier that stabilizes creamy formulas without common irritation.
In plain English
Steareth-4 Stearate is a man-made ingredient that helps water and oil mix together in creams and lotions. Think of it as a peacekeeper that stops your moisturizer from separating into watery and oily layers. It's considered very mild and is widely used in products for sensitive skin.
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-4 Stearate 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-4 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
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-4 Stearate is a polyethylene glycol (PEG) derivative of stearic acid, a fatty acid found naturally in shea butter and cocoa butter. It is produced synthetically to create a stable, non-irritating emulsifier.
How it works
It works by reducing the surface tension between oil and water molecules, allowing them to form a smooth, uniform mixture. This ensures your cream or lotion stays consistent and spreads evenly on your skin.
Pros
Gentle on skin
Steareth-4 Stearate has a very low irritation score, making it suitable for sensitive skin types and daily use.
Improves product feel
It helps create a smooth, non-greasy texture that spreads easily, so your moisturizer feels light and pleasant.
Cons and cautions
Synthetic origin
It is not naturally derived, which may be a drawback for those seeking plant-based or 'clean' beauty products.
Manufacturing concerns
As a PEG compound, there is a theoretical risk of contamination with 1,4-dioxane during production, though reputable brands test for purity.
Best for
- Anyone with normal to sensitive skin looking for a stable moisturizer
- People who prefer fragrance-free, basic formulas
Use caution if
- Those strictly avoiding all PEG-derived ingredients (rare concern)
Usage tips
Safety summary
Steareth-4 Stearate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. The main concern is theoretical contamination with 1,4-dioxane, but reputable manufacturers test for purity.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that PEG stearates, including Steareth-4 Stearate, are safe for use in cosmetics when formulated properly. No significant human or animal toxicity has been reported at typical use levels.
Common label clues
- Typical concentration
- 1–5%
- Regulatory status
- Approved for use in cosmetics worldwide, including by the U.S. FDA and EU CosIng database, with no concentration restrictions for leave-on products.
- Common uses
- Moisturizers, Creams, Lotions, Cleansers
- Environmental note
- As a synthetic PEG compound, it is not readily biodegradable, but it is used in low concentrations and is not considered a major environmental concern.
Good to know
- Steareth-4 Stearate is often used in 'sulfate-free' cleansers to help blend oils without harsh detergents.
- It is considered safe by major cosmetic safety panels at typical use levels.
Common questions
What is Steareth-4 Stearate in beauty products?
Steareth-4 Stearate is a man-made ingredient that helps water and oil mix together in creams and lotions. Think of it as a peacekeeper that stops your moisturizer from separating into watery and oily layers. It's considered very mild and is widely used in products for sensitive skin.
What does Steareth-4 Stearate do in a beauty product?
It works by reducing the surface tension between oil and water molecules, allowing them to form a smooth, uniform mixture. This ensures your cream or lotion stays consistent and spreads evenly on your skin.
Is Steareth-4 Stearate safe for most people?
Steareth-4 Stearate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. The main concern is theoretical contamination with 1,4-dioxane, but reputable manufacturers test for purity.
Who should be careful with Steareth-4 Stearate?
Those strictly avoiding all PEG-derived ingredients (rare concern)
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.