Ingredient review
Sodium Carboxymethyl Dextran
INCI: SODIUM CARBOXYMETHYL DEXTRAN
A gentle, water-soluble derivative of dextran that helps hydrate and form a light film on skin, often used to improve texture and moisture retention.
In plain English
Sodium carboxymethyl dextran is a modified sugar molecule derived from dextran (a natural polysaccharide produced by bacteria). In skincare, it acts like a sponge that holds water on the skin's surface, helping to keep it hydrated. It also creates a very thin, invisible film that can make skin feel smoother and temporarily reduce the look of fine lines. Because it's water-soluble and gentle, it's often found in serums and moisturizers for sensitive or dry skin.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Sodium Carboxymethyl 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 Sodium Carboxymethyl 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
A semi-synthetic polymer created by chemically adding carboxymethyl groups to dextran, a natural polysaccharide. This modification makes it water-soluble and gives it film-forming and water-binding properties.
How it works
It sits on the skin's surface, attracting and holding water molecules (humectancy) while also forming a flexible, breathable film that helps reduce water loss. This dual action supports the skin's natural moisture barrier without feeling heavy or sticky.
Pros
Lightweight hydration
Holds water on the skin without leaving a sticky or greasy residue, making it ideal for daytime use under makeup.
Gentle for sensitive skin
Low irritation and comedogenic risk means it's unlikely to clog pores or cause redness, even for reactive skin types.
Cons and cautions
Modest hydrating power
While it does attract moisture, its water-binding capacity is generally lower than that of hyaluronic acid or glycerin, so it may not be enough for very dry skin.
Limited independent research
Most evidence comes from ingredient suppliers or studies on dextran derivatives, not large-scale independent clinical trials on this specific form.
Best for
- People with normal to combination skin looking for lightweight hydration
- Those who prefer water-based, non-oily skincare textures
Use caution if
- Individuals with extremely dry or dehydrated skin may need a more potent humectant like hyaluronic acid or glycerin
Usage tips
Safety summary
Sodium carboxymethyl dextran is considered safe for topical cosmetic use. It has low irritation and sensitization potential, and no significant safety concerns have been reported in the available literature.
Research notes
Research on sodium carboxymethyl dextran in cosmetics is limited but consistent with its role as a mild humectant and film former. Studies on similar dextran derivatives support its safety and functionality. More independent clinical data would strengthen the evidence base.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for cosmetic use in most regions including the EU, US, and Asia. Generally recognized as safe when used at typical concentrations.
- Common uses
- Serums, Moisturizers, Masks, Eye creams
- Environmental note
- Dextran is a renewable resource produced via bacterial fermentation. The carboxymethylation process uses chemical reagents, but the final ingredient is biodegradable.
Good to know
- Sodium carboxymethyl dextran is often combined with other humectants like glycerin or hyaluronic acid for enhanced hydration.
- It is derived from dextran, which is produced by bacteria (Leuconostoc mesenteroides) and then chemically modified.
Common questions
What is Sodium Carboxymethyl Dextran in beauty products?
Sodium carboxymethyl dextran is a modified sugar molecule derived from dextran (a natural polysaccharide produced by bacteria). In skincare, it acts like a sponge that holds water on the skin's surface, helping to keep it hydrated. It also creates a very thin, invisible film that can make skin feel smoother and temporarily reduce the look of fine lines. Because it's water-soluble and gentle, it's often found in serums and moisturizers for sensitive or dry skin.
What does Sodium Carboxymethyl Dextran do in a beauty product?
It sits on the skin's surface, attracting and holding water molecules (humectancy) while also forming a flexible, breathable film that helps reduce water loss. This dual action supports the skin's natural moisture barrier without feeling heavy or sticky.
Is Sodium Carboxymethyl Dextran safe for most people?
Sodium carboxymethyl dextran is considered safe for topical cosmetic use. It has low irritation and sensitization potential, and no significant safety concerns have been reported in the available literature.
Who should be careful with Sodium Carboxymethyl Dextran?
Individuals with extremely dry or dehydrated skin may need a more potent humectant like hyaluronic acid or glycerin
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.