Science
Mechanism of Action
This ingredient operates by leveraging the humectant properties of sorbitol, a sugar alcohol that attracts and retains water in the skin's outermost layer, thereby boosting hydration. Its polypropylene glycol component acts as an effective solubilizer and solvent, improving the integration and stability of other active compounds within a formulation, while also contributing to product slip and texture.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sorbitol, a key component, exhibits excellent water solubility and supports the stability of certain vitamins across a broad pH range of 3.0 to 9.0. However, it can form chelates with divalent and trivalent metal ions under strongly acidic or alkaline conditions and may cause discoloration when reacting with iron oxide. Formulations should also ensure that the PPG components are non-irritating.
Synergies
- Vitamins (enhanced stability)
Conflicts
- Divalent and trivalent metal ions (in strongly acidic and alkaline conditions)
- Iron oxide
- Penicillins (increases degradation rate in neutral and aqueous solutions)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Polypropylene Glycols (PPGs), including PPG-33, are safe for use in cosmetics when formulated to be non-irritating. Similarly, sugar alcohols such as Sorbitol are considered safe. Sorbitol is further affirmed as Generally Recognized As Safe (GRAS) by the FDA for direct food consumption. No specific SCCS opinion exists for PPG-33 Sorbitol as a combined ingredient.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PPG-33 Sorbitol is a valuable, multi-functional ingredient known for its humectant and solvent properties, contributing to skin hydration and product aesthetics with a low risk of irritation across all skin types.
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