Ingredient review
Steareth-5 Stearate
INCI: Steareth-5 Stearate
A gentle emulsifier that helps create stable, creamy textures without heavy irritation or pore-clogging concerns.
In plain English
Steareth-5 Stearate is a helper ingredient that allows water and oil to mix together in a stable cream or lotion. Think of it like a friendly bridge that keeps the formula from separating. It is made from a fatty acid (stearic acid) and a gentle synthetic alcohol (steareth-5), so it is very mild on skin and unlikely to cause breakouts or stinging.
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
Steareth-5 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-5 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-5 Stearate is a semi-synthetic emulsifier created by reacting stearic acid (a natural fatty acid) with steareth-5 (a polyethylene glycol ether of stearyl alcohol). It belongs to the stearate family and is widely used in cosmetics for its ability to stabilize oil-in-water emulsions.
How it works
In a cosmetic product, Steareth-5 Stearate sits at the boundary between oil and water droplets, reducing surface tension so they stay mixed. This prevents the product from separating into an oily layer and a watery layer, giving you a smooth, uniform cream or lotion every time you pump or scoop it out.
Pros
Gentle on skin
Steareth-5 Stearate has a very low irritation score in safety assessments, making it a good choice for sensitive skin formulas.
Stable emulsions
It helps creams and lotions stay mixed and smooth over time, so you don't get watery or oily separation.
Cons and cautions
Not natural
It is semi-synthetic, which may be a drawback for consumers seeking 100% natural or organic products.
Potential heaviness at high levels
If used above 5%, it can make a formula feel slightly greasy or heavy, especially on oily skin types.
Best for
- Anyone looking for a stable, non-irritating moisturizer or cream
- People with sensitive or reactive skin who need gentle emulsifiers
Use caution if
- Those strictly avoiding all ethoxylated ingredients (though Steareth-5 Stearate is considered very low risk)
Usage tips
Safety summary
Steareth-5 Stearate is considered safe for cosmetic use with very low irritation and comedogenic potential. The CIR panel has reviewed it and found no significant safety concerns at typical concentrations.
Research notes
Safety data is based on the broader stearate and ethoxylated alcohol family. No specific human studies on Steareth-5 Stearate alone were found, but its chemical relatives have a strong safety record.
Common label clues
- Typical concentration
- 1–5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed it safe at concentrations up to 5%.
- Common uses
- Moisturizers, Creams, Lotions, Makeup foundations
- Environmental note
- As a semi-synthetic compound, its biodegradability is moderate. It is not known to bioaccumulate significantly.
Good to know
- Steareth-5 Stearate is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels.
- It is often used in 'clean beauty' formulations as a milder alternative to harsher emulsifiers.
Common questions
What is Steareth-5 Stearate in beauty products?
Steareth-5 Stearate is a helper ingredient that allows water and oil to mix together in a stable cream or lotion. Think of it like a friendly bridge that keeps the formula from separating. It is made from a fatty acid (stearic acid) and a gentle synthetic alcohol (steareth-5), so it is very mild on skin and unlikely to cause breakouts or stinging.
What does Steareth-5 Stearate do in a beauty product?
In a cosmetic product, Steareth-5 Stearate sits at the boundary between oil and water droplets, reducing surface tension so they stay mixed. This prevents the product from separating into an oily layer and a watery layer, giving you a smooth, uniform cream or lotion every time you pump or scoop it out.
Is Steareth-5 Stearate safe for most people?
Steareth-5 Stearate is considered safe for cosmetic use with very low irritation and comedogenic potential. The CIR panel has reviewed it and found no significant safety concerns at typical concentrations.
Who should be careful with Steareth-5 Stearate?
Those strictly avoiding all ethoxylated ingredients (though Steareth-5 Stearate is considered very low risk)
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.