Ingredient review
Carboxymethyl Chitosan Succinamide
INCI: CARBOXYMETHYL CHITOSAN SUCCINAMIDE
A gentle, water-loving derivative of chitosan that helps hydrate and form a protective film on the skin, with early research suggesting soothing benefits.
In plain English
Carboxymethyl Chitosan Succinamide is a modified version of chitosan, which comes from the shells of shrimp and other crustaceans. In skincare, it acts like a sponge that holds water onto your skin and creates a thin, breathable film that helps keep moisture in and irritants out. It's often used in serums and moisturizers for a smooth, hydrated feel without being sticky or heavy.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- semi synthetic
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Carboxymethyl Chitosan Succinamide 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 Carboxymethyl Chitosan Succinamide.
- 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
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A semi-synthetic polymer derived from chitosan (from crustacean shells) that has been chemically modified to be water-soluble and more stable. It combines carboxymethyl and succinamide groups to improve its ability to bind water and form a flexible film on the skin.
How it works
When applied to the skin, it forms a thin, flexible film that reduces water loss (transepidermal water loss, or TEWL — the amount of moisture that evaporates from your skin). Its carboxymethyl groups attract and hold water molecules, providing humectant hydration. The succinamide modification may also help calm irritation by interacting with skin proteins in a gentle way.
Pros
Gentle hydration
Attracts and holds water to the skin without the stickiness of some other humectants, making it suitable for sensitive skin types.
Protective film
Creates a breathable barrier that helps lock in moisture and may shield the skin from environmental stressors, improving overall comfort.
Cons and cautions
Limited research
Most studies on carboxymethyl chitosan succinamide are early-stage or lab-based, so its long-term benefits and efficacy in cosmetic products are not yet fully established.
Source concerns
Derived from crustacean shells, which may be an issue for vegans or those with shellfish allergies, though the purification process often removes allergenic proteins.
Best for
- People with dry or dehydrated skin looking for a gentle humectant
- Those with sensitive or easily irritated skin who want a soothing, film-forming ingredient
Use caution if
- Individuals with a known shellfish allergy should check with their dermatologist, as chitosan is derived from crustacean shells
Usage tips
Safety summary
Carboxymethyl Chitosan Succinamide is considered safe for topical use at typical cosmetic concentrations. It has low irritation and comedogenic potential. As with any ingredient, patch testing is recommended for those with sensitive skin or shellfish allergies.
Research notes
Early studies suggest carboxymethyl chitosan derivatives have good biocompatibility, moisture-binding capacity, and film-forming properties. However, specific clinical trials on this exact ingredient in cosmetic formulations are limited, and most evidence comes from material science and preliminary skin model studies.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Serums, Moisturizers, Masks, Eye creams
- Environmental note
- Chitosan is sourced from shellfish waste (a byproduct of the seafood industry), which can be considered a more sustainable use of resources. However, the chemical modification process involves synthetic reagents.
Good to know
- Carboxymethyl Chitosan Succinamide is often used in 'clean beauty' formulations as a natural-derived alternative to synthetic film-formers.
- It is compatible with most other skincare ingredients, including acids and antioxidants.
Common questions
What is Carboxymethyl Chitosan Succinamide in beauty products?
Carboxymethyl Chitosan Succinamide is a modified version of chitosan, which comes from the shells of shrimp and other crustaceans. In skincare, it acts like a sponge that holds water onto your skin and creates a thin, breathable film that helps keep moisture in and irritants out. It's often used in serums and moisturizers for a smooth, hydrated feel without being sticky or heavy.
What does Carboxymethyl Chitosan Succinamide do in a beauty product?
When applied to the skin, it forms a thin, flexible film that reduces water loss (transepidermal water loss, or TEWL — the amount of moisture that evaporates from your skin). Its carboxymethyl groups attract and hold water molecules, providing humectant hydration. The succinamide modification may also help calm irritation by interacting with skin proteins in a gentle way.
Is Carboxymethyl Chitosan Succinamide safe for most people?
Carboxymethyl Chitosan Succinamide is considered safe for topical use at typical cosmetic concentrations. It has low irritation and comedogenic potential. As with any ingredient, patch testing is recommended for those with sensitive skin or shellfish allergies.
Who should be careful with Carboxymethyl Chitosan Succinamide?
Individuals with a known shellfish allergy should check with their dermatologist, as chitosan is derived from crustacean shells
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.