Ingredient review

Isosteareth-200 Linoleate

INCI: ISOSTEARETH-200 LINOLEATE

A gentle emulsifier that helps oil and water mix, making creams and cleansers feel smooth without heavy residue.

beautyskincareemulsifier

In plain English

Isosteareth-200 Linoleate is a helper ingredient that allows oil and water to blend together in products like lotions and cleansers. It also has a mild cleansing ability and can leave skin feeling soft. Because it's made from a fatty acid found in sunflower and safflower oils, it's considered gentle and unlikely to clog pores or cause irritation for most people.

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: semi synthetic
Evidence: moderate
Irritation: low
Clogging risk: low

How reviews are scored

Quick decision guide

Useful, but context matters

Isosteareth-200 Linoleate 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 Isosteareth-200 Linoleate.
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 semi-synthetic emulsifier created by reacting isostearyl alcohol (a fatty alcohol) with ethylene oxide and linoleic acid (an omega-6 fatty acid). It belongs to the ether carboxylate family and is often used in mild cleansing and moisturizing formulas.

How it works

It reduces the surface tension between oil and water, allowing them to form a stable mixture (emulsion). In cleansers, it helps lift dirt and makeup without stripping the skin's natural oils. In moisturizers, it helps spread the product evenly and leaves a non-greasy, soft finish.

Pros

Gentle on skin

Unlike harsher sulfates, this emulsifier cleans without stripping moisture, making it suitable for daily use on dry or sensitive skin.

Improves product feel

It helps create a smooth, creamy texture that spreads easily and leaves a soft, non-tacky finish on the skin.

Cons and cautions

Ethoxylation concerns

As an ethoxylated ingredient, trace amounts of 1,4-dioxane (a potential contaminant) may be present, though reputable manufacturers purify to safe levels.

Not for 'clean' purists

Some consumers avoid ethoxylated ingredients altogether, so this may not fit a 'no synthetics' or 'minimal processing' preference.

Best for

People with normal to dry skin looking for a gentle cleanser or moisturizer
Those who prefer non-foaming, creamy textures

Use caution if

Individuals who strictly avoid ethoxylated ingredients due to personal preference or sensitivity concerns

Usage tips

Look for this ingredient in creamy cleansers and lotions if you prefer a non-foaming, moisturizing wash.

If you have very sensitive skin, patch test a new product containing this ingredient before full use.

Safety summary

Isosteareth-200 Linoleate is considered safe for cosmetic use at typical concentrations. It has low irritation and comedogenic potential. The main concern is the potential presence of 1,4-dioxane from ethoxylation, but reputable brands use purification steps to minimize this. Overall, it is a well-tolerated ingredient for most skin types.

Research notes

There is limited direct clinical research on Isosteareth-200 Linoleate specifically, but it is structurally similar to other well-studied ethoxylated emulsifiers. Safety assessments by cosmetic ingredient review panels support its use in rinse-off and leave-on products at low concentrations. Its linoleate component is recognized as a skin-conditioning agent.

Common label clues

Typical concentration: 0.5% to 5%
Regulatory status: Approved for use in cosmetics in the EU, US, and most major markets. Manufacturers are expected to keep 1,4-dioxane levels below 10 ppm (often much lower).
Common uses: Cleansers, Lotions, Creams, Makeup removers
Environmental note: As a semi-synthetic ingredient, its biodegradability depends on the specific formulation. It is not known to be a significant environmental concern at typical usage levels.

Good to know

Linoleic acid is an omega-6 fatty acid that is also found naturally in skin's barrier, so this ingredient may support barrier function.
The '200' in the name refers to the number of ethylene oxide units, which affects its water solubility and mildness.

Common questions

What is Isosteareth-200 Linoleate in beauty products?

What does Isosteareth-200 Linoleate do in a beauty product?

Is Isosteareth-200 Linoleate safe for most people?

Who should be careful with Isosteareth-200 Linoleate?

Individuals who strictly avoid ethoxylated ingredients due to personal preference or sensitivity concerns

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Ethoxylated IngredientsOpen PubChem - Isosteareth-200 LinoleateOpen 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.