Ingredient review
Laureth-50
INCI: Laureth-50
A gentle, large-molecule surfactant that cleanses without stripping the skin, but may not be ideal for those avoiding ethoxylated ingredients.
In plain English
Laureth-50 is a cleansing and emulsifying ingredient made from lauryl alcohol (a fatty alcohol from coconut or palm oil) and ethylene oxide. The '50' refers to the number of ethylene oxide units, which makes it a large, water-loving molecule. This size means it is very mild on the skin—it cleanses without stripping away too many natural oils. It helps mix oil and water in products like cleansers and lotions, keeping them stable and easy to rinse off. Because it is ethoxylated, it may contain trace amounts of 1,4-dioxane, a potential impurity, though reputable manufacturers purify it to very low levels.
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
Laureth-50 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 Laureth-50.
- 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
A semi-synthetic surfactant and emulsifier created by reacting lauryl alcohol with 50 units of ethylene oxide, resulting in a large, gentle molecule that helps remove dirt and oil while allowing water and oil to blend.
How it works
In a cosmetic product, Laureth-50 reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. Its large molecular size makes it less penetrating and less likely to irritate the skin compared to smaller surfactants. It surrounds dirt and oil particles, helping water rinse them away without overly drying the skin.
Pros
Very gentle on skin
Its large molecular structure means it stays on the surface and cleanses without penetrating or irritating the skin barrier, making it suitable for sensitive or dry skin types.
Effective emulsifier
It helps oil and water mix smoothly in products, improving texture and stability so you get a consistent, pleasant formula every time.
Cons and cautions
Ethoxylation concerns
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane, a potential carcinogen. Reputable brands purify it, but some consumers prefer to avoid it entirely.
Not fully natural
It is semi-synthetic and derived from petrochemical processes, which may not appeal to those seeking plant-based or biodegradable alternatives.
Best for
- People with normal to dry skin looking for a mild cleanser
- Those who prefer gentle, low-irritation surfactants in their daily routine
Use caution if
- Individuals who strictly avoid any ethoxylated ingredients due to personal or environmental concerns
Usage tips
Safety summary
Laureth-50 is considered safe for use in cosmetics at typical concentrations. The main safety concern is the potential presence of 1,4-dioxane, but reputable suppliers purify the ingredient to meet regulatory limits. It has low irritation and comedogenic risk, making it suitable for most skin types.
Research notes
Studies on ethoxylated surfactants like Laureth-50 indicate low acute toxicity and skin irritation. The Cosmetic Ingredient Review (CIR) panel has reviewed similar ethoxylated alcohols and found them safe when formulated to minimize impurities. More specific data on Laureth-50 is limited, but it is widely used in commercial products.
Common label clues
- Typical concentration
- 1–5% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database, with typical concentration limits in rinse-off products. Manufacturers are expected to keep 1,4-dioxane levels below 10 ppm.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Laureth-50 is not readily biodegradable, which may be a concern for eco-conscious consumers. Some natural alternatives break down more quickly in the environment.
Good to know
- The number '50' indicates a high degree of ethoxylation, which makes the molecule very water-soluble and gentle.
- Laureth-50 is often used in combination with other surfactants to improve foam quality and mildness.
Common questions
What is Laureth-50 in beauty products?
Laureth-50 is a cleansing and emulsifying ingredient made from lauryl alcohol (a fatty alcohol from coconut or palm oil) and ethylene oxide. The '50' refers to the number of ethylene oxide units, which makes it a large, water-loving molecule. This size means it is very mild on the skin—it cleanses without stripping away too many natural oils. It helps mix oil and water in products like cleansers and lotions, keeping them stable and easy to rinse off. Because it is ethoxylated, it may contain trace amounts of 1,4-dioxane, a potential impurity, though reputable manufacturers purify it to very low levels.
What does Laureth-50 do in a beauty product?
In a cosmetic product, Laureth-50 reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. Its large molecular size makes it less penetrating and less likely to irritate the skin compared to smaller surfactants. It surrounds dirt and oil particles, helping water rinse them away without overly drying the skin.
Is Laureth-50 safe for most people?
Laureth-50 is considered safe for use in cosmetics at typical concentrations. The main safety concern is the potential presence of 1,4-dioxane, but reputable suppliers purify the ingredient to meet regulatory limits. It has low irritation and comedogenic risk, making it suitable for most skin types.
Who should be careful with Laureth-50?
Individuals who strictly avoid any ethoxylated ingredients due to personal or environmental 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.