Ingredient review
Propylene Glycol Diundecanoate
INCI: Propylene Glycol Diundecanoate
A gentle, non-greasy emollient that improves skin feel and helps other ingredients spread evenly.
In plain English
Propylene Glycol Diundecanoate is a synthetic oil-like ingredient made from propylene glycol and a fatty acid from castor oil. It sits on the skin's surface to soften and smooth it, without leaving a heavy or sticky feel. Think of it as a lightweight moisturizing helper that also makes creams and lotions spread more nicely.
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
Propylene Glycol Diundecanoate 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 Propylene Glycol Diundecanoate.
- 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
An ester formed by combining propylene glycol with undecanoic acid (a fatty acid derived from castor oil). It is a clear, oily liquid used in cosmetics as an emollient and texture enhancer.
How it works
It forms a thin, breathable film on the skin that reduces water loss and fills in rough patches, making skin feel softer. It also helps other ingredients mix together smoothly and improves the overall feel of a product.
Pros
Lightweight feel
Unlike heavier oils, this ingredient absorbs quickly without leaving a greasy residue, making it ideal for daytime use.
Improves product texture
It helps creams and lotions spread evenly and feel silky on the skin, enhancing the overall user experience.
Cons and cautions
Synthetic origin
It is lab-made, which may be a turn-off for those seeking 100% natural or plant-based skincare.
Limited independent research
Most safety data comes from industry sources, and long-term skin effects are not extensively studied in independent research.
Best for
- People with normal to dry skin looking for lightweight hydration
- Anyone who prefers non-greasy, fast-absorbing moisturizers
Use caution if
- Those with known sensitivity to propylene glycol derivatives (rare)
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. Rare allergic reactions possible in sensitive individuals.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel support its use. Limited independent studies exist, but no major safety concerns have been identified.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. No known restrictions at typical concentrations.
- Common uses
- Moisturizers, Serums, Sunscreens, Makeup foundations
- Environmental note
- Biodegradable and derived from renewable castor oil, but synthetic processing may have a moderate environmental footprint.
Good to know
- It is often used as a replacement for silicones in 'silicone-free' formulations.
- Derived from castor oil, making it a renewable resource.
Common questions
What is Propylene Glycol Diundecanoate in beauty products?
Propylene Glycol Diundecanoate is a synthetic oil-like ingredient made from propylene glycol and a fatty acid from castor oil. It sits on the skin's surface to soften and smooth it, without leaving a heavy or sticky feel. Think of it as a lightweight moisturizing helper that also makes creams and lotions spread more nicely.
What does Propylene Glycol Diundecanoate do in a beauty product?
It forms a thin, breathable film on the skin that reduces water loss and fills in rough patches, making skin feel softer. It also helps other ingredients mix together smoothly and improves the overall feel of a product.
Is Propylene Glycol Diundecanoate safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. Rare allergic reactions possible in sensitive individuals.
Who should be careful with Propylene Glycol Diundecanoate?
Those with known sensitivity to propylene glycol derivatives (rare)
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.