Ingredient review
Microbial Cellulose
INCI: CELLULOSE
Microbial cellulose is a gentle, plant-free film former that helps lock in moisture and gives products a smooth, silky feel.
In plain English
Microbial cellulose is a type of fiber made by friendly bacteria during fermentation. In skincare, it forms a thin, breathable film on your skin that helps hold moisture in and can make the product feel smooth and silky. It's often used in sheet masks because it clings well to the face and delivers ingredients effectively.
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
- biotech
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Microbial Cellulose 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 Microbial Cellulose.
- 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
Microbial cellulose is a natural polymer produced by certain bacteria (like Komagataeibacter xylinus) through fermentation. It is chemically identical to plant cellulose but has a finer, more uniform fiber structure, making it highly absorbent and flexible.
How it works
When applied to the skin, microbial cellulose creates a thin, flexible film that reduces water loss (transepidermal water loss, or TEWL) and helps active ingredients stay on the skin longer. It also provides a smooth, non-sticky feel and can improve the texture of formulations.
Pros
Excellent hydration support
Microbial cellulose helps lock moisture into the skin by forming a thin, breathable barrier, making it great for dry or dehydrated skin.
Sustainable and gentle
Produced through fermentation, it is biodegradable and generally very well-tolerated, even by sensitive skin types.
Cons and cautions
Film sensation may bother some
As the product dries, the film can feel slightly tight or mask-like, which some people may find uncomfortable.
Not a standalone active
Microbial cellulose is a texture and delivery ingredient, not a direct active like vitamin C or retinol, so it works best in combination with other ingredients.
Best for
- Anyone looking for extra hydration and a smooth skin feel
- People with dry or dehydrated skin who want a gentle film-forming ingredient
Use caution if
- Those who dislike any film-forming sensation on the skin
Usage tips
Safety summary
Microbial cellulose is considered very safe for topical use. It is non-irritating, non-comedogenic, and well-tolerated by most skin types, including sensitive skin. No significant safety concerns have been reported.
Research notes
Studies show microbial cellulose is an effective film-former that reduces transepidermal water loss and improves skin hydration. Its fine fiber structure also makes it an excellent carrier for active ingredients in sheet masks. Research is ongoing but current evidence supports its benefits in cosmetic formulations.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved as a cosmetic ingredient globally, including by the EU CosIng database and FDA (as cellulose). Generally recognized as safe for topical use.
- Common uses
- Sheet masks, Serums, Moisturizers, Eye patches
- Environmental note
- Microbial cellulose is biodegradable and produced through fermentation, making it a more eco-friendly option compared to many petroleum-based film-formers.
Good to know
- Microbial cellulose is often used in high-end sheet masks because of its ability to conform closely to the skin.
- It is considered a sustainable alternative to synthetic film-formers like polyacrylates.
Common questions
What is Microbial Cellulose in beauty products?
Microbial cellulose is a type of fiber made by friendly bacteria during fermentation. In skincare, it forms a thin, breathable film on your skin that helps hold moisture in and can make the product feel smooth and silky. It's often used in sheet masks because it clings well to the face and delivers ingredients effectively.
What does Microbial Cellulose do in a beauty product?
When applied to the skin, microbial cellulose creates a thin, flexible film that reduces water loss (transepidermal water loss, or TEWL) and helps active ingredients stay on the skin longer. It also provides a smooth, non-sticky feel and can improve the texture of formulations.
Is Microbial Cellulose safe for most people?
Microbial cellulose is considered very safe for topical use. It is non-irritating, non-comedogenic, and well-tolerated by most skin types, including sensitive skin. No significant safety concerns have been reported.
Who should be careful with Microbial Cellulose?
Those who dislike any film-forming sensation on the skin
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.