Ingredient review
Dextran
INCI: Dextran
Dextran is a gentle, sugar-derived polymer that helps products feel smooth and hydrated without clogging pores.
In plain English
Dextran is a natural sugar molecule made by bacteria. In skincare, it forms a thin, flexible film on your skin that helps lock in moisture and makes the product feel silky. It's very gentle and unlikely to cause irritation or breakouts.
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
Dextran 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 Dextran.
- 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
Dextran is a complex sugar (polysaccharide) produced by certain bacteria, commonly used in cosmetics as a film-forming and moisturizing ingredient.
How it works
When applied to skin, dextran creates a lightweight, breathable film that reduces water loss (transepidermal water loss, or TEWL) and gives a smooth, non-sticky feel. It also helps other ingredients spread evenly.
Pros
Gentle on sensitive skin
Dextran has a very low irritation and comedogenic rating, making it suitable for even the most reactive skin types.
Improves product texture
It gives serums and creams a silky, non-greasy finish that many users find pleasant and easy to layer.
Cons and cautions
Limited hydration power
Dextran is more of a film-former than a deep humectant, so it works best alongside other moisturizing ingredients.
Potential tackiness at high levels
In formulas with more than 2% dextran, some users may notice a slight sticky or tacky feel after application.
Best for
- People with sensitive or reactive skin
- Those looking for a lightweight moisturizing boost without heavy oils
Use caution if
- Individuals with known allergies to bacterial fermentation products (rare)
Usage tips
Safety summary
Dextran is considered very safe for topical use. It is non-irritating, non-sensitizing, and non-comedogenic in typical cosmetic concentrations.
Research notes
Studies confirm dextran's film-forming and moisturizing properties. Its safety profile is well-established, with no significant adverse effects reported in cosmetic use.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for cosmetic use globally, including by the EU CosIng database and the US FDA as a safe ingredient in cosmetics.
- Common uses
- Serums, Moisturizers, Masks
- Environmental note
- Dextran is produced via bacterial fermentation, a renewable process, and is biodegradable.
Good to know
- Dextran is often used in 'biopolymer' skincare blends for its smooth texture.
- It is not the same as dextrin, another sugar-derived ingredient with different properties.
Common questions
What is Dextran in beauty products?
Dextran is a natural sugar molecule made by bacteria. In skincare, it forms a thin, flexible film on your skin that helps lock in moisture and makes the product feel silky. It's very gentle and unlikely to cause irritation or breakouts.
What does Dextran do in a beauty product?
When applied to skin, dextran creates a lightweight, breathable film that reduces water loss (transepidermal water loss, or TEWL) and gives a smooth, non-sticky feel. It also helps other ingredients spread evenly.
Is Dextran safe for most people?
Dextran is considered very safe for topical use. It is non-irritating, non-sensitizing, and non-comedogenic in typical cosmetic concentrations.
Who should be careful with Dextran?
Individuals with known allergies to bacterial fermentation products (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.