Science
Mechanism of Action
Propylene Glycol operates as a potent humectant by attracting and binding water molecules from the surrounding environment to the skin's outer layers, thereby bolstering hydration and preserving the epidermal moisture barrier. Its solvent capabilities enable the uniform dissolution and distribution of active compounds within a formulation. Furthermore, it functions as a penetration enhancer, facilitating the deeper delivery of beneficial ingredients into the skin for optimized efficacy.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 At low concentrations, Glycol significantly improves skin hydration by acting as a humectant, allowing the skin to retain water, resulting in a more supple and hydrated complexion.
- 02 Formulations containing Glycol in concentrations between 1% and 20% are generally well-tolerated across diverse skin types, exhibiting a low risk of sensitization for most individuals.
- 03 To effectively enhance the transdermal penetration of other active ingredients, Glycol is typically required at concentrations ranging from 10% to 25%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Glycol significantly contributes to the structural integrity and longevity of cosmetic products by enhancing freeze-thaw stability, preventing degradation at extreme temperatures. It also plays a crucial role in maintaining formulation consistency and preventing phase separation.
Synergies
- Enhances the penetration and efficacy of other active ingredients by facilitating their deeper delivery into the skin.
Conflicts
- Can inadvertently escort potentially irritating substances or harsh acids deeper into the skin, intensifying their impact.
- High concentrations of Glycol may elevate the risk of pore occlusion, particularly when combined with other known comedogenic ingredients.
Safety
Safety Profile
The CIR Expert Panel deems Propylene Glycol safe in cosmetic formulations when designed to be non-irritating, even acknowledging concentrations exceeding 50% from a previous assessment. The FDA recognizes it as 'generally recognized as safe' (GRAS) for food use. However, concentrations above 50% carry a potential for mild irritation, especially on compromised or highly sensitive skin. Isolated instances of irritant and allergic contact dermatitis, including contact urticaria, have been reported in sensitive individuals, with reactions observed at concentrations as low as 2%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Glycol is a valuable ingredient, expertly hydrating the skin and enhancing active ingredient delivery, though careful formulation is essential for sensitive skin types to minimize potential irritation at higher concentrations.
Related
Similar Ingredients
Finding similar ingredients…