Ingredient review
Carboxymethyl Levan
INCI: Carboxymethyl Levan
A gentle, biotech-derived film former that helps lock in moisture and may soothe the skin without clogging pores.
In plain English
Carboxymethyl Levan is a sugar-based molecule made by fermenting bacteria in a lab. In skincare, it creates a thin, invisible film on your skin that holds water close to the surface, helping to keep your skin hydrated and plump. Think of it like a lightweight, breathable shield that reduces water loss without feeling heavy or sticky.
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
- biotech
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Carboxymethyl Levan 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 Levan.
- 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
Carboxymethyl Levan is a chemically modified version of levan, a natural polysaccharide (a long chain of sugar molecules) produced by certain bacteria. The carboxymethyl group is added to improve its water solubility and stability, making it easier to use in cosmetic formulas.
How it works
When applied to the skin, Carboxymethyl Levan forms a flexible, non-occlusive film. This film slows down the evaporation of water from the skin's surface (transepidermal water loss, or TEWL), acting as a gentle humectant and barrier booster. It also has a slight thickening effect, giving products a smooth, silky feel.
Pros
Gentle hydration without clogging pores
Carboxymethyl Levan is non-comedogenic and unlikely to cause breakouts, making it a safe choice for acne-prone and oily skin types.
Smooth, silky skin feel
The film it forms is flexible and lightweight, giving skin a smooth, velvety texture that works well under makeup or sunscreen.
Cons and cautions
Limited research on long-term benefits
Most evidence comes from lab studies and short-term tests; more human trials are needed to confirm its anti-aging or barrier-repair claims.
Potential tackiness at high concentrations
In formulas with more than 2%, it can leave a slightly sticky or tacky residue, which some users may find unpleasant.
Best for
- Anyone looking for a lightweight, non-comedogenic hydrator
- People with sensitive or easily irritated skin
Use caution if
- Those who prefer a very matte, powder-dry finish (the film may leave a subtle soft-focus feel)
Usage tips
Safety summary
Carboxymethyl Levan has a low irritation and sensitization potential based on available safety data. It is considered safe for use in leave-on and rinse-off cosmetics at typical concentrations.
Research notes
Early research suggests Carboxymethyl Levan can reduce transepidermal water loss and improve skin hydration. However, most studies are small or in vitro; larger, independent human trials are needed to confirm its efficacy relative to established humectants.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Generally recognized as safe for use in cosmetics; no specific restrictions in the EU, US, or other major markets.
- Common uses
- Serums, Moisturizers, Masks, Eye creams
- Environmental note
- Produced through bacterial fermentation using renewable feedstocks, and is biodegradable, reducing environmental persistence compared to some synthetic polymers.
Good to know
- Carboxymethyl Levan is produced via fermentation, making it a sustainable, vegan-friendly ingredient.
- It is often used as a natural alternative to synthetic film-formers like polyvinyl alcohol (PVA).
Common questions
What is Carboxymethyl Levan in beauty products?
Carboxymethyl Levan is a sugar-based molecule made by fermenting bacteria in a lab. In skincare, it creates a thin, invisible film on your skin that holds water close to the surface, helping to keep your skin hydrated and plump. Think of it like a lightweight, breathable shield that reduces water loss without feeling heavy or sticky.
What does Carboxymethyl Levan do in a beauty product?
When applied to the skin, Carboxymethyl Levan forms a flexible, non-occlusive film. This film slows down the evaporation of water from the skin's surface (transepidermal water loss, or TEWL), acting as a gentle humectant and barrier booster. It also has a slight thickening effect, giving products a smooth, silky feel.
Is Carboxymethyl Levan safe for most people?
Carboxymethyl Levan has a low irritation and sensitization potential based on available safety data. It is considered safe for use in leave-on and rinse-off cosmetics at typical concentrations.
Who should be careful with Carboxymethyl Levan?
Those who prefer a very matte, powder-dry finish (the film may leave a subtle soft-focus feel)
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.