Ingredient review
Laureth-8 Carboxylic Acid
INCI: LAURETH-8 CARBOXYLIC ACID
A gentle, non-stripping surfactant that cleanses effectively without disrupting the skin barrier.
In plain English
Laureth-8 carboxylic acid is a mild cleansing ingredient that helps remove dirt, oil, and makeup from your skin without leaving it feeling tight or dry. It belongs to a family of surfactants that are less harsh than traditional soaps and sulfates, making it a good choice for sensitive or dry 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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Laureth-8 Carboxylic Acid 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-8 Carboxylic Acid.
- 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 created by reacting lauryl alcohol (from coconut or palm oil) with ethylene oxide, then adding a carboxylic acid group. This structure gives it both water-loving and oil-loving properties, allowing it to lift away impurities.
How it works
In a cleanser, laureth-8 carboxylic acid reduces the surface tension between water and oil, helping to break down sebum, sunscreen, and makeup. Its mild anionic nature means it cleanses without over-stripping the skin's natural moisture barrier.
Pros
Mild on skin
Unlike harsh sulfates, laureth-8 carboxylic acid cleanses without stripping natural oils, making it ideal for daily use on sensitive or dry skin.
Good for barrier health
Its gentle nature helps preserve the skin's moisture barrier, reducing the risk of irritation and transepidermal water loss.
Cons and cautions
Potential trace impurities
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane, a byproduct that is regulated and typically kept at safe levels in cosmetics.
Sustainability concerns
The lauryl alcohol source is often palm or coconut oil, which can be associated with deforestation unless certified sustainable.
Best for
- People with dry or sensitive skin looking for a non-stripping cleanser
- Anyone seeking a sulfate-free alternative in their cleansing routine
Use caution if
- Those with known allergies to ethoxylated ingredients (rare)
Usage tips
Safety summary
Laureth-8 carboxylic acid is considered safe for cosmetic use at typical concentrations. The main concern is trace 1,4-dioxane, which is tightly regulated. Overall, it has a low irritation and comedogenic risk.
Research notes
Studies on ethoxylated surfactants show they are generally mild and well-tolerated. The Cosmetic Ingredient Review (CIR) panel has reviewed similar alkyl ether carboxylic acids and found them safe for use in cosmetics.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. Trace 1,4-dioxane levels are regulated to safe limits (typically below 10 ppm in finished products).
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- The raw materials may come from palm or coconut oil. Look for RSPO-certified or sustainably sourced versions to reduce environmental impact.
Good to know
- Laureth-8 carboxylic acid is often listed as 'PEG-8 Lauryl Ether Carboxylic Acid' on some labels.
- It is considered a 'secondary surfactant' and is usually blended with other mild cleansers to improve foam and feel.
Common questions
What is Laureth-8 Carboxylic Acid in beauty products?
Laureth-8 carboxylic acid is a mild cleansing ingredient that helps remove dirt, oil, and makeup from your skin without leaving it feeling tight or dry. It belongs to a family of surfactants that are less harsh than traditional soaps and sulfates, making it a good choice for sensitive or dry skin types.
What does Laureth-8 Carboxylic Acid do in a beauty product?
In a cleanser, laureth-8 carboxylic acid reduces the surface tension between water and oil, helping to break down sebum, sunscreen, and makeup. Its mild anionic nature means it cleanses without over-stripping the skin's natural moisture barrier.
Is Laureth-8 Carboxylic Acid safe for most people?
Laureth-8 carboxylic acid is considered safe for cosmetic use at typical concentrations. The main concern is trace 1,4-dioxane, which is tightly regulated. Overall, it has a low irritation and comedogenic risk.
Who should be careful with Laureth-8 Carboxylic Acid?
Those with known allergies to ethoxylated ingredients (rare)
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.