Polyglycerin-3 is a multi-functional humectant and solvent consisting of three polymerized glycerin units. It provides intensive, long-lasting hydration with a smoother, less tacky skin feel than standard monomeric glycerin.
- INCI Name:
- Polyglycerin-3
- Chemical/Scientific Name:
- 1,2,3-Propanetriol, homopolymer (n=3)
- Common Aliases:
- Triglycerol, Triglycerin
| Category: | Moisturizers |
| Source Origin: | Synthetic or Vegetable-derived (typically palm or coconut oil) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Personal Care, Food |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Hydration/Moisture: | |
| Texture Enhancement: | |
| Irritation Risk: |
Primary Benefits:
- Delivers sustained moisture to the stratum corneum through its high hygroscopic capacity.
- Enhances the “slip” and spreadability of water-based serums without adding oiliness.
- Functions as an effective carrier for botanical extracts and active substances.
- Reduces the stickiness typically associated with high concentrations of Glycerin.
Potential Risks:
- Negligible risk profile; extremely well-tolerated by sensitive or reactive skin types.
Biological Action & Cosmetic Profile
Molecular architecture determines the distinct performance of this polyol. While Glycerin is a small trihydric alcohol that migrates quickly into the skin, the polymerized structure of three glycerin units creates a larger molecule. This increased size allows it to remain on the skin surface and within the upper layers of the epidermis longer, providing a reservoir effect for hydration. It works by forming hydrogen bonds with water molecules, preventing trans-epidermal water loss (TEWL) even in low-humidity environments.Aesthetic elegance is a primary driver for its use in modern formulations. Formulators often substitute a portion of Glycerin with this ingredient to achieve a “dewy” finish that feels silky rather than syrupy. Its refractive index contributes to a subtle optical smoothing effect on the skin surface, making it a preferred humectant for hydrating primers and “glass skin” essences.
Broader Applications & Origins
Vegetable oils serve as the typical starting point for the production of this material. Through a process of controlled polymerization, manufacturers link three glycerin molecules together, ensuring a high degree of purity and specific molecular weight. This material is not only a standalone humectant but also serves as the structural backbone for various “polyglyceryl” emulsifiers, which are widely utilized in PEG-free and natural-certified skincare.
Routine Integration
Synergies:
- Sodium Hyaluronate: Combines short-term plumping with the sustained moisture retention of the polyglycerol.
- Panthenol: Enhances barrier repair while providing a soothing, humectant base.
- Betaine: Works alongside polyols to manage osmotic stress in skin cells.
- Propanediol: Improves penetration of the formula while maintaining a lightweight, non-greasy texture.
Conflicts:
- No known biochemical conflicts; compatible with all major active ingredients including retinoids and acids.
Clinical Consensus & Safety
Dermatological assessments consistently categorize this ingredient as non-irritating and non-sensitizing. The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated the polyglyceryl group and concluded they are safe for use in cosmetic formulations. Because it is a large, hydrophilic molecule, it does not penetrate the bloodstream, remaining localized to the skin’s surface where its humectant properties are most effective. Clinical studies on similar polyols indicate that it may actually reduce the irritation potential of other surfactants in a formula.
Is Polyglycerin-3 better than regular glycerin?
Neither is objectively “better,” but they serve different sensory purposes. Polyglycerin-3 offers longer-lasting moisture and a more sophisticated, non-sticky texture, whereas Glycerin is a more powerful, immediate humectant that is slightly more cost-effective for basic hydration.
Is this ingredient safe for acne-prone skin?
Yes, it is completely non-comedogenic and water-soluble. It provides necessary hydration to oily or acne-prone skin without clogging pores or contributing to the lipid load that can exacerbate breakouts.
Is it considered a “natural” ingredient?
While the polymerization process is a chemical reaction, the raw material is almost always derived from plant-based sources. It is widely accepted in ECOCERT and COSMOS-certified natural and organic skincare products.