Science
Mechanism of Action
Cellulose functions multifacetedly in skincare. It primarily serves as a thickener, viscosity controller, and emulsion stabilizer, contributing to desirable product texture and consistency. On the skin, it can absorb and retain water, creating a moisturizing film that minimizes moisture evaporation and supports the skin's natural moisturizing factors. Specific forms, like microcrystalline cellulose, can absorb excess oil and sebum, and provide gentle exfoliation by aiding in the removal of dead skin cells. Furthermore, cellulose forms a protective barrier on the skin's surface, helping to prevent moisture loss and guarding against environmental pollutants. It also plays a crucial role in stabilizing sensitive active ingredients, such as UV filters and DHA, and can enhance the delivery and efficacy of other active compounds by acting as a carrier.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Non-irritating to mildly irritating, non-sensitizing, and non-photosensitizing when tested at concentrations up to 100%.
- 02 Bacterial cellulose masks significantly increased skin moisture after a single application on 30 volunteers.
- 03 Hemp/cellulose nanocrystals (CNCs)-based foundation liquid at 10 mg/mL (1%) demonstrated good biocompatibility with HaCaT cells and no significant cytotoxicity.
Transparency
Dusting Analysis
Cellulose primarily functions as a functional excipient and structural component rather than a potent isolated active. Its effects, whether for texture, film-forming, or gentle exfoliation, are concentration-dependent within the formulation's design and do not typically fall under the 'dusting' paradigm for active ingredients where a minimum threshold is required for efficacy.
The Formula
Formulation
Stability
While unmodified cellulose is insoluble in water, cosmetic-grade cellulose derivatives are engineered for solubility or dispersibility in aqueous phases. Fibrillar cellulose forms exhibit stability across extreme pH ranges. Formulations containing cellulose nanocrystals have shown stability at pH 5.0-6.0 for a period of 3 months. Its stable chemical structure allows it to stabilize sensitive active ingredients within formulations.
Synergies
- Acts as a carrier to enhance the efficacy of other active ingredients.
- Stabilizes sensitive active agents such as UV filters and DHA.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) panel has deemed cellulose and its derivatives safe for cosmetic use at concentrations up to 100%. Studies indicate practical non-toxicity via various exposure routes and no significant developmental or reproductive effects. It is minimally irritating to eyes and non-irritating to slightly irritating to the skin at concentrations up to 100%. Mutagenic activity was not demonstrated. While generally safe, individuals with known cellulose allergies should perform a patch test. The FDA grants cellulose gel GRAS (Generally Recognized As Safe) status for food use, which implies high biocompatibility but does not equate to FDA approval for cosmetics.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Cellulose is a valuable and versatile ingredient that enhances formulation stability and texture while providing proven skin benefits such as hydration, barrier support, and gentle exfoliation.
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