Ingredient review

Dihydroxyethyl C9-11 Alkoxypropylamine Oxide

INCI: DIHYDROXYETHYL C9-11 ALKOXYPROPYLAMINE OXIDE

A gentle surfactant that helps create a rich, creamy foam while being less stripping than traditional sulfates.

beautyskincarecleanser

In plain English

This ingredient is a mild cleansing agent that helps your face wash or body wash produce a nice, bubbly lather without stripping away too much of your skin's natural moisture. It's often used in formulas that aim to be gentler than traditional sulfate-based cleansers.

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

Dihydroxyethyl C9-11 Alkoxypropylamine Oxide 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Dihydroxyethyl C9-11 Alkoxypropylamine Oxide.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

An amine oxide surfactant derived from fatty alcohols (C9-11 chain) modified with dihydroxyethyl and alkoxypropyl groups. It is a synthetic amphoteric compound that can act as a non-ionic or slightly cationic surfactant depending on pH.

How it works

It reduces the surface tension between water and oil, allowing dirt and excess sebum to be rinsed away. It also stabilizes foam and thickens the product texture, giving a luxurious feel during cleansing.

Pros

Mild on skin

Less stripping than sodium lauryl sulfate, making it suitable for daily use and sensitive skin types.

Foam booster

Improves lather volume and creaminess, enhancing the sensory experience of cleansers and body washes.

Cons and cautions

Synthetic origin

Derived from petrochemicals, which may not align with natural or 'clean' beauty preferences.

Potential irritant at high levels

Though generally mild, high concentrations can still cause stinging or redness for very reactive skin.

Best for

  • People with normal to dry skin looking for a milder cleanser
  • Anyone who prefers sulfate-free or low-foam formulas

Use caution if

  • Those with known sensitivity to amine oxides (rare)
  • Strict 'clean beauty' users avoiding all synthetic surfactants

Usage tips

Look for it in the middle of the ingredient list — that's a sign it's used at a moderate, effective level.
Pair with a moisturizing routine after cleansing to maintain skin barrier health.

Safety summary

Considered safe for use in rinse-off cosmetics at typical concentrations. Rare reports of mild irritation in sensitive individuals. No known links to serious health concerns.

Research notes

Limited peer-reviewed studies specific to this ingredient, but the broader class of amine oxide surfactants is well-studied and regarded as safe by cosmetic safety panels.

Common label clues

Typical concentration
1% to 5%
Regulatory status
Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions at typical use levels.
Common uses
Facial cleansers, Body washes, Shampoos, Shower gels
Environmental note
Biodegradability data is limited for this specific compound, but amine oxides in general are considered moderately biodegradable.

Good to know

  • Amine oxides like this one are often used to reduce the irritation potential of stronger surfactants in a formula.
  • It is compatible with both anionic and cationic ingredients, making it versatile in many rinse-off products.

Common questions

What is Dihydroxyethyl C9-11 Alkoxypropylamine Oxide in beauty products?

This ingredient is a mild cleansing agent that helps your face wash or body wash produce a nice, bubbly lather without stripping away too much of your skin's natural moisture. It's often used in formulas that aim to be gentler than traditional sulfate-based cleansers.

What does Dihydroxyethyl C9-11 Alkoxypropylamine Oxide do in a beauty product?

It reduces the surface tension between water and oil, allowing dirt and excess sebum to be rinsed away. It also stabilizes foam and thickens the product texture, giving a luxurious feel during cleansing.

Is Dihydroxyethyl C9-11 Alkoxypropylamine Oxide safe for most people?

Considered safe for use in rinse-off cosmetics at typical concentrations. Rare reports of mild irritation in sensitive individuals. No known links to serious health concerns.

Who should be careful with Dihydroxyethyl C9-11 Alkoxypropylamine Oxide?

Those with known sensitivity to amine oxides (rare) Strict 'clean beauty' users avoiding all synthetic surfactants

Research sources

Cosmetic Ingredient Review (CIR) - Amine Oxides SafetyOpenPubChem - Amine Oxides OverviewOpenEuropean Chemicals Agency (ECHA) - Amine OxidesOpen

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.