Ingredient review
Glyceryl Undecylenate
INCI: Glyceryl Undecylenate
A mild, multifunctional ingredient that softens skin and helps keep products fresh without harsh preservatives.
In plain English
Glyceryl undecylenate is a gentle ingredient made from glycerin and undecylenic acid (a fatty acid from castor beans). It works as an emollient, meaning it helps smooth and soften the skin's surface. It also has mild antimicrobial properties, which help protect the product from germs and extend its shelf life. Because it is very gentle and unlikely to clog pores, it is often used in sensitive-skin and baby products.
Review score
Safety, usefulness, and evidence
Strong fit for many routines
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Easy yes for most routines
Glyceryl Undecylenate 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 Glyceryl Undecylenate.
- 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
Glyceryl undecylenate is an ester formed by combining glycerin with undecylenic acid, a natural fatty acid derived from castor oil. It appears as a clear to slightly yellow liquid and is used in cosmetics as a skin-conditioning agent and a mild preservative booster.
How it works
When applied to the skin, glyceryl undecylenate spreads into a thin, non-greasy film that helps reduce water loss and leaves skin feeling smooth. Its undecylenic acid component gives it mild antifungal and antibacterial activity, which helps prevent microbial growth in the product without relying on strong preservatives.
Pros
Gentle emollient
Leaves skin feeling soft and smooth without a heavy or sticky residue, making it ideal for daily moisturizers and lotions.
Mild preservation support
Helps reduce the need for harsher preservatives, which can be beneficial for sensitive skin and baby care formulations.
Cons and cautions
Not a standalone preservative
It works best when combined with other preservative ingredients; on its own it may not fully protect a product from contamination.
Limited research on long-term use
While generally regarded as safe, there are fewer long-term studies compared to more common emollients like glycerin or dimethicone.
Best for
- People with dry or normal skin looking for a light emollient
- Those who prefer products with milder preservation systems
Use caution if
- Individuals with a known allergy to castor oil derivatives (very rare)
Usage tips
Safety summary
Glyceryl undecylenate is considered very safe for topical use. It has low irritation and comedogenic potential, and is well-tolerated even by sensitive skin. Allergic reactions are extremely rare.
Research notes
Research supports its use as a mild antimicrobial and emollient. The Cosmetic Ingredient Review panel has evaluated it and found it safe for use in cosmetics at typical concentrations. Most evidence comes from formulation studies and safety assessments rather than large-scale clinical trials.
Common label clues
- Typical concentration
- 0.5% to 3%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. Listed as a safe ingredient by the Cosmetic Ingredient Review (CIR) panel.
- Common uses
- Moisturizers, Cleansers, Sunscreens, Baby care, Leave-on creams
- Environmental note
- Derived from renewable castor oil and considered biodegradable, making it a relatively eco-friendly choice for formulators.
Good to know
- Glyceryl undecylenate is often used in 'preservative-free' or 'self-preserving' formulas, though it is technically a preservative booster.
- It is biodegradable and considered environmentally friendly compared to some synthetic preservatives.
Common questions
What is Glyceryl Undecylenate in beauty products?
Glyceryl undecylenate is a gentle ingredient made from glycerin and undecylenic acid (a fatty acid from castor beans). It works as an emollient, meaning it helps smooth and soften the skin's surface. It also has mild antimicrobial properties, which help protect the product from germs and extend its shelf life. Because it is very gentle and unlikely to clog pores, it is often used in sensitive-skin and baby products.
What does Glyceryl Undecylenate do in a beauty product?
When applied to the skin, glyceryl undecylenate spreads into a thin, non-greasy film that helps reduce water loss and leaves skin feeling smooth. Its undecylenic acid component gives it mild antifungal and antibacterial activity, which helps prevent microbial growth in the product without relying on strong preservatives.
Is Glyceryl Undecylenate safe for most people?
Glyceryl undecylenate is considered very safe for topical use. It has low irritation and comedogenic potential, and is well-tolerated even by sensitive skin. Allergic reactions are extremely rare.
Who should be careful with Glyceryl Undecylenate?
Individuals with a known allergy to castor oil derivatives (very 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.