Ingredient review

Sodium Carboxymethyl Dextran Sulfate

INCI: SODIUM CARBOXYMETHYL DEXTRAN SULFATE

A gentle, semi-synthetic humectant that helps hydrate and calm the skin, often used in sensitive-skin formulas.

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In plain English

Sodium Carboxymethyl Dextran Sulfate is a sugar-based ingredient that has been chemically modified to help it hold water and soothe the skin. Think of it as a sponge that attracts moisture and also helps calm irritation. It's commonly found in serums and moisturizers for sensitive or reactive skin.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Sodium Carboxymethyl Dextran Sulfate 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Sodium Carboxymethyl Dextran Sulfate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A semi-synthetic derivative of dextran, a natural polysaccharide produced by bacteria. It has been chemically modified with carboxymethyl and sulfate groups to enhance its water-binding and soothing abilities.

How it works

It forms a thin, water-attracting film on the skin's surface, helping to keep moisture in. Additionally, it has been shown to inhibit certain inflammatory pathways, which can help reduce redness and irritation.

Pros

Gentle hydration

Provides moisture without the stickiness or irritation some humectants can cause, making it ideal for sensitive skin.

Calming properties

Research suggests it can help reduce redness and soothe irritation, offering benefits beyond simple hydration.

Cons and cautions

Less researched

Compared to hyaluronic acid or glycerin, there are fewer studies on its long-term efficacy and safety in cosmetics.

Needs companions

As a humectant, it works best when paired with emollients and occlusives to lock in moisture, especially in dry climates.

Best for

  • People with sensitive or reactive skin
  • Those looking for a gentle hydrating ingredient
  • Individuals with dry or dehydrated skin

Use caution if

  • People with known allergies to dextran or its derivatives (rare)

Usage tips

Apply to damp skin to maximize hydration
Layer with a moisturizer containing occlusives like shea butter or squalane for best results
Use in a serum or toner before heavier creams

Safety summary

Sodium Carboxymethyl Dextran Sulfate is considered safe for topical use in cosmetics. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin.

Research notes

Research indicates it has humectant and anti-inflammatory properties. However, most studies are in vitro or small-scale, and more human clinical trials are needed to fully confirm its benefits.

Common label clues

Typical concentration
0.1% to 2%
Regulatory status
Generally recognized as safe for use in cosmetics in the US and EU, with no known restrictions at typical use levels.
Common uses
Serums, Moisturizers, Eye creams, Soothing masks
Environmental note
Dextran is derived from bacterial fermentation, which is a renewable process. The chemical modification steps require energy and reagents, but overall it is considered a relatively sustainable ingredient.

Good to know

  • It is often used in formulations for sensitive skin because of its low irritation potential.
  • It is not a common ingredient, so you may need to check product labels carefully.

Common questions

What is Sodium Carboxymethyl Dextran Sulfate in beauty products?

Sodium Carboxymethyl Dextran Sulfate is a sugar-based ingredient that has been chemically modified to help it hold water and soothe the skin. Think of it as a sponge that attracts moisture and also helps calm irritation. It's commonly found in serums and moisturizers for sensitive or reactive skin.

What does Sodium Carboxymethyl Dextran Sulfate do in a beauty product?

It forms a thin, water-attracting film on the skin's surface, helping to keep moisture in. Additionally, it has been shown to inhibit certain inflammatory pathways, which can help reduce redness and irritation.

Is Sodium Carboxymethyl Dextran Sulfate safe for most people?

Sodium Carboxymethyl Dextran Sulfate is considered safe for topical use in cosmetics. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin.

Who should be careful with Sodium Carboxymethyl Dextran Sulfate?

People with known allergies to dextran or its derivatives (rare)

Research sources

CosIng - European Commission DatabaseOpenPubMed - Anti-inflammatory effects of dextran sulfateOpenINCIDecoder - Ingredient ProfileOpen

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.