Ingredient review

C18-38 Alkyl Hydroxystearoyl Stearate

INCI: C18-38 ALKYL HYDROXYSTEAROYL STEARATE

A reliable synthetic wax that gives lipsticks and creams a smooth, non-greasy texture and helps them hold their shape.

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In plain English

This is a man-made wax that helps keep makeup and skincare products thick, stable, and easy to apply. It's often used in lipsticks to make them glide on smoothly without feeling sticky or greasy. Think of it as a structural helper that gives products a nice, creamy consistency.

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

C18-38 Alkyl Hydroxystearoyl Stearate 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 C18-38 Alkyl Hydroxystearoyl Stearate.
  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

A synthetic ester wax derived from stearic acid and a long-chain alcohol. It is a solid at room temperature and melts at skin temperature, which makes it ideal for stick products.

How it works

It acts as a thickener and stabilizer. In a lipstick, it helps the stick hold its shape while also providing a smooth, even application. In creams, it helps create a rich, non-greasy texture and can help prevent the product from separating over time.

Pros

Smooth texture

Creates a silky, non-sticky feel on the lips and skin, making application pleasant and even.

Low irritation risk

Rarely causes allergic reactions or clogs pores, making it suitable for sensitive skin types.

Cons and cautions

Synthetic origin

Made from petrochemicals, which may be a concern for those seeking natural or plant-based ingredients.

Potential heaviness

In very high amounts, it can make a product feel thick or waxy, which might not suit all preferences.

Best for

  • Anyone looking for a smooth, non-greasy lipstick or balm
  • People with normal to dry skin who enjoy rich cream textures

Use caution if

  • Those who strictly avoid synthetic ingredients
  • People with very oily skin who prefer ultra-light, water-based gels

Usage tips

Look for it in lipsticks and balms for a creamy, long-lasting feel.
If you prefer lighter textures, choose products where this ingredient appears lower on the ingredient list.

Safety summary

C18-38 Alkyl Hydroxystearoyl Stearate is considered safe for use in cosmetics. It has a low potential for skin irritation and is non-comedogenic. It is not known to be toxic or carcinogenic.

Research notes

Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that this ingredient is safe for use in cosmetics at typical concentrations. It is well-tolerated and does not pose significant health risks.

Common label clues

Typical concentration
1% to 10%
Regulatory status
Approved for use in cosmetics in the US (FDA) and EU (CosIng). No known restrictions at typical use levels.
Common uses
Lipsticks, Lip balms, Stick foundations, Creams, Lotions, Anhydrous balms
Environmental note
As a synthetic ingredient, it is not biodegradable and is derived from non-renewable resources. However, it is used in small amounts and is not considered a major environmental concern.

Good to know

  • It is often used alongside other waxes like candelilla or carnauba to fine-tune texture.
  • It is considered safe for use in cosmetics by major regulatory bodies.

Common questions

What is C18-38 Alkyl Hydroxystearoyl Stearate in beauty products?

This is a man-made wax that helps keep makeup and skincare products thick, stable, and easy to apply. It's often used in lipsticks to make them glide on smoothly without feeling sticky or greasy. Think of it as a structural helper that gives products a nice, creamy consistency.

What does C18-38 Alkyl Hydroxystearoyl Stearate do in a beauty product?

It acts as a thickener and stabilizer. In a lipstick, it helps the stick hold its shape while also providing a smooth, even application. In creams, it helps create a rich, non-greasy texture and can help prevent the product from separating over time.

Is C18-38 Alkyl Hydroxystearoyl Stearate safe for most people?

C18-38 Alkyl Hydroxystearoyl Stearate is considered safe for use in cosmetics. It has a low potential for skin irritation and is non-comedogenic. It is not known to be toxic or carcinogenic.

Who should be careful with C18-38 Alkyl Hydroxystearoyl Stearate?

Those who strictly avoid synthetic ingredients People with very oily skin who prefer ultra-light, water-based gels

Research sources

Cosmetic Ingredient Review (CIR) Safety AssessmentOpenEuropean Commission CosIng DatabaseOpenFDA Cosmetics InformationOpen

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.