Ingredient review

Acetylated Hydrogenated Castor Oil

INCI: ACETYLATED HYDROGENATED CASTOR OIL

A gentle, non-greasy emollient derived from castor oil that helps soften and smooth the skin without clogging pores.

beautyskincareemollient

In plain English

Acetylated hydrogenated castor oil is a modified version of castor oil that has been hydrogenated (hardened) and acetylated (chemically altered) to make it more stable and less greasy. It spreads easily on the skin, leaving a soft, silky feel without a heavy residue. It's often used in lip products and moisturizers to improve texture and provide a smooth application.

Quick decision guide

Useful, but context matters

Acetylated Hydrogenated Castor Oil 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 Acetylated Hydrogenated Castor Oil.
  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 semi-synthetic wax-like ingredient made by chemically modifying castor oil. Hydrogenation turns the liquid oil into a solid wax, and acetylation further improves its spreadability and skin feel.

How it works

It forms a thin, protective film on the skin's surface that helps lock in moisture and reduce water loss. Its emollient properties soften the skin and improve the texture of cosmetic formulations, making them glide on smoothly.

Pros

Non-greasy emollient

Leaves skin feeling soft and smooth without a heavy, oily residue, making it ideal for daytime use and lip products.

Low irritation potential

Generally well-tolerated by most skin types, including sensitive skin, with a very low risk of irritation or allergic reaction.

Cons and cautions

May not suit very oily skin

While non-greasy, it is still an emollient and could feel slightly heavy for those with very oily or acne-prone skin if used in high concentrations.

Derived from a potential allergen

Castor oil is a rare allergen; individuals with a known sensitivity should avoid products containing this ingredient.

Best for

  • People with dry or normal skin looking for a gentle emollient
  • Anyone who wants a smooth, non-sticky lip balm or lipstick

Use caution if

  • Individuals with a known allergy to castor oil or its derivatives

Usage tips

Look for this ingredient in lip balms and lipsticks for a smooth, comfortable application.
In moisturizers, it works well as a daytime emollient under makeup.

Safety summary

Acetylated hydrogenated castor oil is considered safe for use in cosmetics. It has a low irritation and comedogenic rating, making it suitable for most skin types. Rare allergic reactions are possible in individuals sensitive to castor oil.

Research notes

While not extensively studied on its own, the safety of hydrogenated castor oil and its derivatives has been reviewed by cosmetic ingredient safety panels (e.g., CIR) and found to be safe for topical use. Its function as an emollient and skin conditioner is well established.

Common label clues

Typical concentration
1% to 10%
Regulatory status
Approved for use in cosmetics in the US (FDA), EU, and many other regions. It is generally recognized as safe when used as intended.
Common uses
Lipsticks, Lip balms, Creams, Lotions, Makeup removers
Environmental note
Castor oil is a renewable plant-based resource. The chemical modification process is standard for cosmetic ingredients and does not raise significant environmental concerns beyond typical manufacturing.

Good to know

  • Acetylated hydrogenated castor oil is often used as a replacement for lanolin in vegan and plant-based cosmetics.
  • It is considered a 'dry' emollient, meaning it provides moisture without a greasy after-feel.

Common questions

What is Acetylated Hydrogenated Castor Oil in beauty products?

Acetylated hydrogenated castor oil is a modified version of castor oil that has been hydrogenated (hardened) and acetylated (chemically altered) to make it more stable and less greasy. It spreads easily on the skin, leaving a soft, silky feel without a heavy residue. It's often used in lip products and moisturizers to improve texture and provide a smooth application.

What does Acetylated Hydrogenated Castor Oil do in a beauty product?

It forms a thin, protective film on the skin's surface that helps lock in moisture and reduce water loss. Its emollient properties soften the skin and improve the texture of cosmetic formulations, making them glide on smoothly.

Is Acetylated Hydrogenated Castor Oil safe for most people?

Acetylated hydrogenated castor oil is considered safe for use in cosmetics. It has a low irritation and comedogenic rating, making it suitable for most skin types. Rare allergic reactions are possible in individuals sensitive to castor oil.

Who should be careful with Acetylated Hydrogenated Castor Oil?

Individuals with a known allergy to castor oil or its derivatives

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Hydrogenated Castor OilOpenPubChem - Acetylated Hydrogenated Castor OilOpenEWG Skin Deep - Acetylated Hydrogenated Castor OilOpen

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.