Ingredient review
C23-43 Acid Pentaerythritol Tetraester
INCI: C23-43 ACID PENTAERYTHRITOL TETRAESTER
A gentle, non-greasy emollient that helps soften and smooth the skin without clogging pores.
In plain English
This is a synthetic oil-like ingredient made by combining a type of fatty acid (C23-43 acids) with pentaerythritol, a sugar alcohol. It spreads easily on the skin, feels lightweight and silky, and helps lock in moisture by forming a protective film. Unlike some heavy oils, it is unlikely to cause breakouts or irritation, making it a good choice for sensitive or acne-prone skin.
Review score
Safety, usefulness, and evidence
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
Quick decision guide
Useful, but context matters
C23-43 Acid Pentaerythritol Tetraester 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 C23-43 Acid Pentaerythritol Tetraester.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic ester created from long-chain fatty acids (C23-43) and pentaerythritol. It is a high-molecular-weight emollient that provides a smooth, non-tacky feel on the skin.
How it works
It sits on the surface of the skin, filling in gaps between skin cells to create a smoother texture. It also reduces water loss by forming a thin, breathable barrier, which helps keep the skin hydrated and soft.
Pros
Lightweight and silky
Unlike heavy oils, this ester spreads easily and leaves a smooth, non-sticky finish, making it ideal for daytime moisturizers and makeup.
Low irritation potential
Clinical and safety data suggest it is very gentle on the skin, with a low risk of allergic reactions or breakouts, even for sensitive skin types.
Cons and cautions
Synthetic origin
It is manufactured in a lab, which may be a drawback for consumers seeking natural or plant-based skincare options.
Limited independent research
Most safety data comes from manufacturer studies, and there are fewer peer-reviewed studies compared to more common emollients like squalane.
Best for
- People with dry or dehydrated skin looking for lightweight moisture
- Those with sensitive or acne-prone skin who want a non-comedogenic emollient
Use caution if
- Individuals who prefer exclusively natural or plant-derived ingredients
Usage tips
Safety summary
C23-43 Acid Pentaerythritol Tetraester is considered safe for cosmetic use based on manufacturer data and analogy to similar esters. It has low irritation and comedogenic potential, and no significant safety concerns have been reported.
Research notes
Direct peer-reviewed studies on this specific ester are limited. However, the broader class of pentaerythritol esters has been reviewed by safety panels and found to be safe in cosmetics. Most evidence comes from industry safety assessments.
Common label clues
- Typical concentration
- 1% to 10% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. The Cosmetic Ingredient Review (CIR) panel has evaluated similar esters and found them safe at typical use levels.
- Common uses
- Moisturizers, Lip products, Eye creams, Foundations, Sunscreens
- Environmental note
- As a synthetic ingredient, its environmental impact depends on manufacturing processes. It is not known to be biodegradable, but it is used in low concentrations.
Good to know
- This ingredient is often used in lip products because it provides a comfortable, non-drying feel.
- It is considered a 'high molecular weight' ester, which means it stays on the skin surface and is less likely to penetrate deeply.
Common questions
What is C23-43 Acid Pentaerythritol Tetraester in beauty products?
This is a synthetic oil-like ingredient made by combining a type of fatty acid (C23-43 acids) with pentaerythritol, a sugar alcohol. It spreads easily on the skin, feels lightweight and silky, and helps lock in moisture by forming a protective film. Unlike some heavy oils, it is unlikely to cause breakouts or irritation, making it a good choice for sensitive or acne-prone skin.
What does C23-43 Acid Pentaerythritol Tetraester do in a beauty product?
It sits on the surface of the skin, filling in gaps between skin cells to create a smoother texture. It also reduces water loss by forming a thin, breathable barrier, which helps keep the skin hydrated and soft.
Is C23-43 Acid Pentaerythritol Tetraester safe for most people?
C23-43 Acid Pentaerythritol Tetraester is considered safe for cosmetic use based on manufacturer data and analogy to similar esters. It has low irritation and comedogenic potential, and no significant safety concerns have been reported.
Who should be careful with C23-43 Acid Pentaerythritol Tetraester?
Individuals who prefer exclusively natural or plant-derived ingredients
Research sources
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.