Cetearyl Isononanoate

What is Cetearyl Isononanoate?

Cetearyl Isononanoate is a synthetic ester formed from cetearyl alcohol, a mixture of cetyl and stearyl alcohols derived from natural fats, and isononanoic acid, a branched-chain carboxylic acid produced via oxidation of isononanol. Primarily used in skincare and haircare products such as creams, lotions, sunscreens, and conditioners, it functions as a texture enhancer by improving spreadability and providing a silky glide during application. Its unique branched structure allows it to form a lightweight lubricating layer on the skin or hair cuticle, reducing tackiness and imparting a velvety after-feel without greasiness. This ingredient excels in oil-in-water emulsions, helping to stabilize formulations and optimize sensory attributes for comfortable wear throughout the day. Commonly found in concentrations that support elegant product textures.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Hair conditioning
Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.
Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.

Benefits

Delivers a smooth, non-oily texture to moisturizers and lotions.

Enhances hair softness and reduces friction for easier styling.

Supports skin suppleness with lightweight lubrication.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People with normal to dry skin seeking comfortable hydration.
People with allergies to fatty alcohol esters.
Individuals wanting non-greasy emollient effects in daily products.
Individuals preferring fully natural ingredient profiles.
Those using hair products for improved manageability.
Those sensitive to synthetic emollients in rare cases.

Safety Notes

  • Considered low hazard in cosmetic use by safety assessments.
  • Non-comedogenic, suitable for acne-prone skin types.

Frequently Asked Questions about Cetearyl Isononanoate

What is Cetearyl Isononanoate?

A synthetic ester used as an emollient to provide smooth texture and lubrication in cosmetics.

Is it comedogenic?

No, it has a comedogenic rating of 0, making it suitable for most skin types.

Safe for daily use?

Yes, safety reviews indicate low hazard for cosmetic applications.