Ingredient review
Laureth-1 Phosphate
INCI: LAURETH-1 PHOSPHATE
A mild, phosphate-based surfactant that helps cleanse without stripping the skin, but may not suit ultra-sensitive types.
In plain English
Laureth-1 Phosphate is a gentle cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It's often used in face washes and shampoos because it cleans without making the skin feel tight or dry. Think of it as a helper that lifts makeup, sunscreen, and excess oil off your face without being harsh.
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-1 Phosphate 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-1 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
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
Laureth-1 Phosphate is a semi-synthetic surfactant made by reacting lauryl alcohol (from coconut or palm oil) with ethylene oxide and phosphoric acid. It belongs to the alkyl phosphate family, known for mild cleansing and emulsifying properties.
How it works
It works by reducing the surface tension between water and oil, allowing them to mix. This helps lift dirt, sebum, and makeup from the skin so they can be washed away. Its phosphate group also gives it a mild, non-stripping feel compared to stronger sulfates.
Pros
Mild on skin
Laureth-1 Phosphate cleanses effectively without stripping the skin's natural moisture barrier, making it suitable for daily use.
Good emulsifier
It helps blend oil and water phases in creams and lotions, improving product texture and stability.
Cons and cautions
Semi-synthetic origin
It is produced through ethoxylation, a chemical process that may raise concerns for those avoiding synthetic processing.
Potential for mild irritation
While generally low-risk, a small percentage of users with very reactive skin may experience slight stinging or redness.
Best for
- People with normal to combination skin looking for a mild cleanser
- Those who prefer sulfate-free cleansing options
Use caution if
- Individuals with known sensitivity to ethoxylated ingredients
- Those seeking fully natural or plant-only formulas
Usage tips
Safety summary
Laureth-1 Phosphate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though ethoxylated ingredients may contain trace impurities (1,4-dioxane) if not properly purified. Reputable manufacturers ensure low impurity levels.
Research notes
Research on alkyl phosphates like Laureth-1 Phosphate shows they are mild surfactants with good skin compatibility. Studies indicate lower irritation compared to sodium lauryl sulfate. However, specific long-term human data on this exact compound is limited.
Common label clues
- Typical concentration
- Typically 0.5% to 5% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions; subject to concentration limits in leave-on products per EU CosIng guidelines.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Derived from renewable plant sources (coconut/palm oil), but the ethoxylation process involves ethylene oxide, which requires careful manufacturing controls.
Good to know
- Laureth-1 Phosphate is often used in combination with other surfactants to create a balanced cleansing system
- It is considered biodegradable and generally safe for aquatic life at low concentrations
Common questions
What is Laureth-1 Phosphate in beauty products?
Laureth-1 Phosphate is a gentle cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It's often used in face washes and shampoos because it cleans without making the skin feel tight or dry. Think of it as a helper that lifts makeup, sunscreen, and excess oil off your face without being harsh.
What does Laureth-1 Phosphate do in a beauty product?
It works by reducing the surface tension between water and oil, allowing them to mix. This helps lift dirt, sebum, and makeup from the skin so they can be washed away. Its phosphate group also gives it a mild, non-stripping feel compared to stronger sulfates.
Is Laureth-1 Phosphate safe for most people?
Laureth-1 Phosphate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though ethoxylated ingredients may contain trace impurities (1,4-dioxane) if not properly purified. Reputable manufacturers ensure low impurity levels.
Who should be careful with Laureth-1 Phosphate?
Individuals with known sensitivity to ethoxylated ingredients Those seeking fully natural or plant-only formulas
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.