Ingredient review
C16-18 Hydroxyalkyl Hydroxydimerdilinoleyl Ether
INCI: C16-18 HYDROXYALKYL HYDROXYDIMERDILINOLEYL ETHER
A gentle, non-greasy emollient that helps soften and smooth skin without clogging pores.
In plain English
This ingredient is a type of oil-like substance made in a lab from fatty acids and a special kind of fatty acid called dimer dilinoleic acid. It spreads easily on the skin, feels silky and not greasy, and helps keep moisture in. It's often used in moisturizers and lip products to make them feel luxurious and to improve the skin's barrier.
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
C16-18 Hydroxyalkyl Hydroxydimerdilinoleyl Ether 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 C16-18 Hydroxyalkyl Hydroxydimerdilinoleyl Ether.
- 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 formed by reacting C16-18 fatty alcohols with hydroxydimerdilinoleic acid, resulting in a large, branched molecule that acts as an emollient and film-former.
How it works
It sits on the skin's surface, filling in gaps between skin cells to create a smooth, soft feel. It also forms a thin, breathable film that reduces water loss (transepidermal water loss, or TEWL) without feeling heavy or sticky.
Pros
Non-greasy hydration
Provides a smooth, silky feel without leaving a heavy or oily residue, making it ideal for daytime use under makeup.
Gentle for sensitive skin
Has a low irritation and comedogenic risk, so it's unlikely to clog pores or cause breakouts, even for those with reactive skin.
Cons and cautions
Synthetic origin
Derived from petrochemical or processed plant sources, which may not appeal to those seeking 100% natural or organic products.
Limited independent research
While safe based on ingredient class, there are few peer-reviewed studies specifically on this compound's long-term effects on skin.
Best for
- People with dry or dehydrated skin looking for a lightweight moisturizer
- Those with sensitive or acne-prone skin who need a non-comedogenic emollient
Use caution if
- Individuals who strictly avoid synthetic ingredients in their skincare routine
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory or industry reviews.
Research notes
Safety is supported by analogy to similar ester emollients and industry safety assessments. Direct clinical studies are limited, but the ingredient class is well-established with a strong safety record.
Common label clues
- Typical concentration
- 1–5% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No known restrictions at typical use levels.
- Common uses
- Moisturizers, Lip products, Eye creams, Anti-aging formulations
- Environmental note
- Synthetic but biodegradable; not known to bioaccumulate. Lower environmental concern than some silicone alternatives.
Good to know
- This ingredient is often used in 'velvet' or 'silk' texture claims in moisturizers and lipsticks.
- It is considered biodegradable and has a favorable environmental profile compared to some silicone-based emollients.
Common questions
What is C16-18 Hydroxyalkyl Hydroxydimerdilinoleyl Ether in beauty products?
This ingredient is a type of oil-like substance made in a lab from fatty acids and a special kind of fatty acid called dimer dilinoleic acid. It spreads easily on the skin, feels silky and not greasy, and helps keep moisture in. It's often used in moisturizers and lip products to make them feel luxurious and to improve the skin's barrier.
What does C16-18 Hydroxyalkyl Hydroxydimerdilinoleyl Ether do in a beauty product?
It sits on the skin's surface, filling in gaps between skin cells to create a smooth, soft feel. It also forms a thin, breathable film that reduces water loss (transepidermal water loss, or TEWL) without feeling heavy or sticky.
Is C16-18 Hydroxyalkyl Hydroxydimerdilinoleyl Ether safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory or industry reviews.
Who should be careful with C16-18 Hydroxyalkyl Hydroxydimerdilinoleyl Ether?
Individuals who strictly avoid synthetic ingredients in their skincare routine
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.