Ingredient review
Phytosteryl Dimer Dilinoleate
INCI: Phytosteryl/Isostearyl/Cetyl/Stearyl/Behenyl Dimer Dilinoleate
A gentle, plant-based emollient that softens skin and improves product feel without clogging pores.
In plain English
This ingredient is a blend of plant-derived fatty substances (phytosterols and long-chain alcohols) combined with a fatty acid from sunflower or similar oils. It works by forming a thin, breathable film on the skin that locks in moisture and makes the skin feel smooth and soft. Unlike heavy oils, it is unlikely to clog pores, making it suitable for many skin types.
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
- natural
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Phytosteryl Dimer Dilinoleate 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 Phytosteryl Dimer Dilinoleate.
- 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 complex ester made from phytosterols (plant compounds similar to cholesterol) and dimer dilinoleic acid (a fatty acid derived from linoleic acid, often from sunflower oil). It is a waxy, non-greasy emollient used in cosmetics to improve texture and provide lasting moisture.
How it works
It sits on the skin's surface, creating a protective layer that reduces water loss (transepidermal water loss, or TEWL) and helps maintain hydration. Its molecular structure allows it to spread easily, giving products a silky, non-sticky feel. It also helps other ingredients absorb better by smoothing the skin's surface.
Pros
Gentle on skin
Derived from plant sources and has a low irritation risk, making it suitable for sensitive skin types.
Non-clogging formula
Its low comedogenic rating means it is unlikely to block pores, a plus for acne-prone users.
Cons and cautions
Can feel heavy for some
In high concentrations, it may feel too rich for very oily skin, potentially leading to a greasy sensation.
Limited research
Compared to common emollients like glycerin or squalane, there is less published research on its long-term skin benefits.
Best for
- People with dry or dehydrated skin looking for a non-greasy moisturizer
- Those with sensitive or acne-prone skin who want a gentle emollient
Use caution if
- Individuals with extremely oily skin who prefer lightweight, water-based products
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risks. No significant safety concerns reported in regulatory reviews.
Research notes
While not extensively studied alone, the component fatty acids and phytosterols have a long history of safe use in cosmetics. The ingredient is recognized for its emollient properties in industry literature.
Common label clues
- Typical concentration
- 1% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the EU CosIng database and the US FDA as a cosmetic ingredient. No known restrictions.
- Common uses
- Moisturizers, Anti-aging creams, Lip products, Hair conditioners
- Environmental note
- Derived from renewable plant sources (phytosterols from soy or pine, and fatty acids from sunflower oil), making it a more sustainable choice compared to petroleum-based emollients.
Good to know
- This ingredient is often found in 'clean beauty' products due to its plant-derived origin.
- It is stable and does not easily oxidize, helping extend product shelf life.
Common questions
What is Phytosteryl Dimer Dilinoleate in beauty products?
This ingredient is a blend of plant-derived fatty substances (phytosterols and long-chain alcohols) combined with a fatty acid from sunflower or similar oils. It works by forming a thin, breathable film on the skin that locks in moisture and makes the skin feel smooth and soft. Unlike heavy oils, it is unlikely to clog pores, making it suitable for many skin types.
What does Phytosteryl Dimer Dilinoleate do in a beauty product?
It sits on the skin's surface, creating a protective layer that reduces water loss (transepidermal water loss, or TEWL) and helps maintain hydration. Its molecular structure allows it to spread easily, giving products a silky, non-sticky feel. It also helps other ingredients absorb better by smoothing the skin's surface.
Is Phytosteryl Dimer Dilinoleate safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risks. No significant safety concerns reported in regulatory reviews.
Who should be careful with Phytosteryl Dimer Dilinoleate?
Individuals with extremely oily skin who prefer lightweight, water-based products
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.