Ingredient review

C12-13 Pareth-10 Phosphate

INCI: C12-13 PARETH-10 PHOSPHATE

A gentle synthetic surfactant that helps cleanse without stripping the skin, commonly used in mild foaming cleansers.

beautyskincaresurfactant

In plain English

This ingredient is a mild soap-like molecule that helps water mix with oils and dirt so they can be rinsed away. It's often used in gentle cleansers because it cleans effectively without being harsh or drying. Think of it as a helper that makes your face wash foam nicely and remove makeup or sunscreen without leaving your skin feeling tight.

Review score

Safety, usefulness, and evidence

4.0Good

4.0/ 5

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

How reviews are scored

Quick decision guide

Useful, but context matters

C12-13 Pareth-10 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 C12-13 Pareth-10 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic surfactant (cleansing agent) made from a blend of C12-13 fatty alcohols, ethylene oxide, and phosphoric acid. It belongs to the class of phosphate esters, which are known for being milder than traditional sulfates.

How it works

It has a water-loving head and an oil-loving tail. When you wash your face, the tails grab onto oils and dirt while the heads stay in water. This allows the impurities to be lifted off the skin and rinsed away. Because it's a phosphate ester, it also helps stabilize emulsions (mixing oil and water) in creams and lotions.

Pros

Mild on skin

Compared to traditional sulfates like SLS, this ingredient is much less likely to cause irritation or dryness, making it suitable for daily use.

Effective cleanser

It removes excess oil, makeup, and sunscreen effectively without leaving a greasy residue, so your skin feels clean but not tight.

Cons and cautions

Synthetic origin

It is manufactured through chemical processes, which may be a concern for those seeking exclusively natural or plant-based ingredients.

Potential for slight dryness

In high concentrations or for very sensitive skin, it can still cause mild dryness or tightness, especially if used in a foaming cleanser multiple times a day.

Best for

People with normal to combination skin looking for a mild cleanser
Those who prefer sulfate-free or gentler cleansing options

Use caution if

Individuals with extremely dry or compromised skin barriers may want even milder options like non-foaming cleansers

Usage tips

Use in a foaming cleanser that you rinse off — avoid leaving it on the skin for extended periods.

Pair with a moisturizer after cleansing to maintain skin hydration.

If you have dry skin, look for products where this ingredient appears lower on the ingredient list.

Safety summary

C12-13 Pareth-10 Phosphate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, making it a good choice for mild cleansers. However, as with any surfactant, overuse or high concentrations may cause dryness in sensitive individuals.

Research notes

Phosphate ester surfactants are well-studied in cosmetic science for their mildness and emulsifying properties. While specific studies on this exact ingredient are limited, the broader class is supported by safety assessments from bodies like the Cosmetic Ingredient Review (CIR).

Common label clues

Typical concentration: 1% to 10% in rinse-off products; lower in leave-on formulas
Regulatory status: Approved for use in cosmetics in the EU, US, and other major markets. Generally recognized as safe when used as directed.
Common uses: Cleansers, Shampoos, Body washes, Facial washes
Environmental note: As a synthetic surfactant, its biodegradability varies. Some phosphate esters are readily biodegradable, but always check the specific product's environmental claims.

Good to know

This ingredient is often used in 'sulfate-free' cleansers as a gentler alternative.
It can also function as an emulsifier in creams and lotions, helping to keep the formula stable.

Common questions

What is C12-13 Pareth-10 Phosphate in beauty products?

What does C12-13 Pareth-10 Phosphate do in a beauty product?

Is C12-13 Pareth-10 Phosphate safe for most people?

Who should be careful with C12-13 Pareth-10 Phosphate?

Individuals with extremely dry or compromised skin barriers may want even milder options like non-foaming cleansers

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Alkyl Phosphate EstersOpen PubChem - C12-13 Pareth-10 PhosphateOpen European Chemicals Agency (ECHA) - Information on ChemicalsOpen

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.