Science
Mechanism of Action
Mannitol primarily acts as a humectant, efficiently attracting and retaining water within the skin's surface layers to prevent dehydration and maintain suppleness. Beyond hydration, it functions as an antioxidant, neutralizing free radicals generated by UV exposure and pollution, thus protecting against premature aging. Additionally, it helps to condition the skin and can improve product texture and stability by acting as a binding or viscosity control agent.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 When co-administered via a "depot" injection with 13.5 mg/g uncross-linked hyaluronic acid, a 0.9% concentration of Mannitol significantly improved skin hydration, anisotropy, and roughness. A separate study indicated Mannitol alone had no irritating effect on the skin.
Transparency
Dusting Analysis
No data suggests Mannitol is commonly used at ineffective 'dusted' concentrations. Its reported maximum concentration in leave-on products is high, indicating its utility at significant levels.
The Formula
Formulation
Stability
Mannitol is readily soluble in water, with an optimal pH range for formulation typically between 5.0 and 6.5. In aqueous solutions, it can become slightly acidic due to hydrogen ion loss, often requiring pH adjustment. Solutions greater than 10% w/v may experience recrystallization, particularly below 21°C, though diluted solutions with a final concentration less than 15% are less prone to this.
Synergies
- Hyaluronic Acid (for enhanced skin hydration and elasticity in injected applications)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded Mannitol is safe for cosmetic use within current practices and concentrations, with a highest reported leave-on dermal exposure at 60.5%. It is also FDA-approved as a Generally Recognized As Safe (GRAS) direct food additive. Mannitol is considered non-toxic, non-irritating, and non-comedogenic, without specific usage restrictions.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Mannitol is a valuable polyol offering versatile humectant and antioxidant benefits, suitable for all skin types due to its excellent safety and compatibility profile.
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