Ingredient review
Dilaureth-4 Phosphate
INCI: DILAURETH-4 PHOSPHATE
An effective synthetic surfactant that helps cleanse and emulsify, but may be drying or irritating for sensitive skin.
In plain English
Dilaureth-4 phosphate is a synthetic ingredient that helps water and oil mix together in products like cleansers and shampoos. It works by reducing the surface tension between these two ingredients, allowing them to blend into a stable formula. This makes it easier to remove dirt, oil, and makeup from your skin. However, because it is a surfactant, it can strip away natural oils, potentially leaving skin feeling dry or tight, especially if you have a sensitive or dry skin type.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Dilaureth-4 Phosphate can be useful, but watch for some irritation potential.
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 Dilaureth-4 Phosphate.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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 synthetic phosphate ester surfactant derived from lauryl alcohol and ethylene oxide, used primarily as a cleansing and emulsifying agent in cosmetic formulations.
How it works
It lowers the surface tension between oil and water, allowing them to mix into a stable emulsion. This helps lift dirt, oil, and impurities from the skin so they can be rinsed away with water.
Pros
Effective cleanser
Removes excess oil, dirt, and makeup efficiently, leaving skin feeling clean.
Good emulsifier
Helps create stable, well-mixed formulas that perform consistently from bottle to skin.
Cons and cautions
Potential irritation
May cause stinging, redness, or dryness in sensitive or reactive skin types.
Can strip moisture
Overuse or high concentrations can remove natural oils, leading to a tight or dehydrated feeling.
Best for
- People with normal to oily skin
- Those looking for a thorough cleanse
Use caution if
- People with dry, sensitive, or compromised skin
- Those with eczema or rosacea
Usage tips
Safety summary
Generally considered safe for use in rinse-off products at typical concentrations. However, it can be moderately irritating, especially for sensitive skin. Avoid prolonged contact and use in leave-on products.
Research notes
Limited direct studies on dilaureth-4 phosphate, but related phosphate ester surfactants are well-documented as effective cleansers with moderate irritation potential. Safety assessments by cosmetic ingredient review panels support its use in rinse-off formulations.
Common label clues
- Typical concentration
- 1% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets, with concentration limits typically guided by safety assessments.
- Common uses
- Cleansers, Shampoos, Body washes, Facial washes
- Environmental note
- As a synthetic surfactant, its biodegradability varies; some phosphate esters may persist in aquatic environments.
Good to know
- Often found in combination with milder surfactants to reduce irritation
- Commonly used in foaming cleansers and shampoos
Common questions
What is Dilaureth-4 Phosphate in beauty products?
Dilaureth-4 phosphate is a synthetic ingredient that helps water and oil mix together in products like cleansers and shampoos. It works by reducing the surface tension between these two ingredients, allowing them to blend into a stable formula. This makes it easier to remove dirt, oil, and makeup from your skin. However, because it is a surfactant, it can strip away natural oils, potentially leaving skin feeling dry or tight, especially if you have a sensitive or dry skin type.
What does Dilaureth-4 Phosphate do in a beauty product?
It lowers the surface tension between oil and water, allowing them to mix into a stable emulsion. This helps lift dirt, oil, and impurities from the skin so they can be rinsed away with water.
Is Dilaureth-4 Phosphate safe for most people?
Generally considered safe for use in rinse-off products at typical concentrations. However, it can be moderately irritating, especially for sensitive skin. Avoid prolonged contact and use in leave-on products.
Who should be careful with Dilaureth-4 Phosphate?
People with dry, sensitive, or compromised skin Those with eczema or rosacea
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.