Ingredient review
Steareth-80
INCI: STEARETH-80
Steareth-80 is a gentle synthetic emulsifier that helps blend oil and water in products, but its ethoxylation process may raise mild purity concerns for some users.
In plain English
Steareth-80 is a man-made ingredient made from stearyl alcohol (a fatty alcohol from plants or petroleum) and ethylene oxide. It acts like a bridge between oil and water, so creams and cleansers stay smooth and don't separate. Think of it as a helper that keeps your lotion from turning into a watery mess. It's considered gentle and is commonly used in rinse-off products like shampoos and body washes.
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-80 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-80.
- 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-80 is a synthetic emulsifier created by reacting stearyl alcohol with 80 units of ethylene oxide. It belongs to the 'steareth' family of ethoxylated alcohols, which are widely used in cosmetics to stabilize mixtures of oil and water.
How it works
In a cosmetic formula, Steareth-80 reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. This prevents separation and gives products a smooth, uniform texture. It also helps other ingredients spread evenly on the skin or hair.
Pros
Gentle emulsifier
Steareth-80 is known for being mild on skin, making it suitable for daily-use cleansers and moisturizers even for sensitive skin types.
Stable formulas
It helps prevent oil and water from separating, so your product stays consistent from first use to last without shaking or stirring.
Cons and cautions
Ethoxylation concerns
The manufacturing process can produce trace amounts of 1,4-dioxane, a potential carcinogen. Reputable brands purify their ingredients to remove it, but it's a concern for some consumers.
Synthetic origin
As a synthetic ingredient, it may not appeal to those seeking natural or minimal-ingredient routines, and it has lower biodegradability compared to plant-based emulsifiers.
Best for
- People looking for gentle, non-irritating cleansers and moisturizers
- Those with normal to dry skin who prefer stable, creamy formulas
Use caution if
- Individuals who strictly avoid any ethoxylated ingredients due to purity concerns
Usage tips
Safety summary
Steareth-80 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 and brands purify the ingredient to meet safety standards. Overall, it poses low irritation and comedogenic risk.
Research notes
Research on Steareth-80 itself is limited, but the broader class of ethoxylated alcohols has been reviewed by safety panels (e.g., CIR) and found safe when impurities are controlled. Studies focus on 1,4-dioxane as a contaminant rather than the ingredient itself.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng). The EU restricts 1,4-dioxane to 10 ppm in finished products, and many manufacturers aim for even lower levels.
- Common uses
- Cleansers, Shampoos, Body washes, Lotions, Creams
- Environmental note
- Steareth-80 is not readily biodegradable in all environments due to its ethoxylate chain. It may persist in water systems, though wastewater treatment can reduce its impact.
Good to know
- Steareth-80 is part of a larger family of 'steareth' ingredients, where the number indicates the average ethylene oxide units (higher numbers = more water-loving).
- The FDA has not banned 1,4-dioxane but recommends manufacturers reduce it to low levels; many brands voluntarily comply.
Common questions
What is Steareth-80 in beauty products?
Steareth-80 is a man-made ingredient made from stearyl alcohol (a fatty alcohol from plants or petroleum) and ethylene oxide. It acts like a bridge between oil and water, so creams and cleansers stay smooth and don't separate. Think of it as a helper that keeps your lotion from turning into a watery mess. It's considered gentle and is commonly used in rinse-off products like shampoos and body washes.
What does Steareth-80 do in a beauty product?
In a cosmetic formula, Steareth-80 reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. This prevents separation and gives products a smooth, uniform texture. It also helps other ingredients spread evenly on the skin or hair.
Is Steareth-80 safe for most people?
Steareth-80 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 and brands purify the ingredient to meet safety standards. Overall, it poses low irritation and comedogenic risk.
Who should be careful with Steareth-80?
Individuals who strictly avoid any ethoxylated ingredients due to purity concerns
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.