Science
Mechanism of Action
This ingredient reduces the surface tension of liquids, a key function of its surfactant properties, by bridging immiscible components like oils and water. Its molecular structure, a polyoxypropylene and polyoxyethylene ether of glycerin, features both lipophilic (oil-attracting) and hydrophilic (water-attracting) regions, which are crucial for forming stable emulsions. As a liquid polypropylene glycol derivative, it also acts as a solvent and solubilizer, facilitating the dissolution and uniform distribution of other ingredients. Notably, it exhibits a beneficial affinity for the skin, and when paired with glycerin, it has been observed to enhance moisturizing effects.
Research
Clinical Evidence
Low confidence2%
Transparency
Dusting Analysis
The Formula
Formulation
Synergies
- glycerin (to boost moisturizing effects)
Conflicts
- other problematic ingredients (may increase irritation likelihood)
Safety
Safety Profile
The CIR Expert Panel has concluded that polypropylene glycols (PPGs) with a value of ≥3, including PPG-24-GLYCERETH-24, are safe for cosmetic use when properly formulated to be non-irritating. However, independent research specifically on this ingredient is limited, with most information provided by suppliers. The EWG notes a low to moderate concern for non-reproductive organ system toxicity. SkinSAFE identifies it as free of common irritants, and it is generally considered non-irritating, although potential for irritation may increase when combined with other problematic ingredients. No specific SCCS opinion or FDA status for this particular ingredient was found.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PPG-24-GLYCERETH-24 is a valuable formulation aid, providing essential emulsifying, solubilizing, and solvent properties while generally demonstrating good skin compatibility and a low irritation risk at standard usage levels.
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