Sodium Carboxymethyl Beta-Glucan
CM-glucan
No meaningful concern for most people; irritation is possible but rare.
Also written as: Carboxymethyl beta-glucan · CM-glucan · CM-BG
What it is
Beta-glucan on its own dissolves poorly in water, so carboxymethyl groups are added to make it fully water-soluble and easier to formulate at useful levels. The modified polymer keeps the soothing and film-forming behaviour of ordinary beta-glucan while producing clearer, less viscous gels. It shows up most often in calming masks, post-procedure gels and after-sun products.
What it does well
Calms inflammatory signalling and supports repair in skin models
Carboxymethyl beta-glucan reduced inflammatory mediators including IL-1 beta and PGE2 through the Dectin-1 receptor, improved barrier proteins and sped wound closure in a 3D skin wound model. The authors note that human clinical confirmation is still needed.
Limited evidence
Worth knowing
Human clinical evidence is not yet published
The mechanistic case is reasonably detailed but rests on cell and tissue-model work. It is a sensible supporting soother, not a proven treatment.
Matters most toPeople choosing a product specifically for post-procedure or eczema-adjacent use, who should rely on clinician advice rather than this ingredient alone.
Where the EU stands
No specific restriction
Not restricted under the EU Cosmetics Regulation; it appears in no annex and has no concentration limit.
Sources (1)
Every link goes to the original: a journal, a PubMed record or an EU document.
- [1]The harnessing potential of carboxymethyl beta glucan: A driver of skin repair
International Journal of Cosmetic Science · 2026 · doi:10.1111/ics.70111
Carboxymethyl beta-glucan reduced pro-inflammatory mediators via Dectin-1, improved barrier function and accelerated wound closure in skin models, with clinical studies still to come.
