Polyglycerin-6 is a versatile, multi-unit humectant and solvent derived from the polymerization of Glycerin. It provides superior moisture retention and skin-conditioning properties while maintaining a smooth, non-tacky finish in cosmetic formulations.
- INCI Name:
- Polyglycerin-6
- Chemical/Scientific Name:
- 1,2,3-Propanetriol, homopolymer (n=6)
- Common Aliases:
- Hexaglycerol, Hexaglycerin
| Category: | Moisturizers |
| Source Origin: | Synthetic or Vegetable-derived |
| Comedogenic Rating: | 0 |
| Primary Industries: | Skincare, Haircare, Food, Pharmaceuticals |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Hydration/Moisture: | |
| Texture Enhancement: | |
| Irritation Risk: | |
| Formula Stability: |
Primary Benefits:
- Intense humectancy that draws moisture from the environment into the skin.
- Improved skin elasticity and suppleness through deep hydration.
- Enhanced spreadability and reduced “soapiness” in emulsions.
- Acts as a stable solvent for botanical extracts and active ingredients.
Potential Risks:
- Extremely low risk of irritation; generally considered safe for sensitive skin.
- Potential for slight stickiness if used at very high concentrations (though significantly less than monomeric Glycerin).
Biological Action & Cosmetic Profile
Polyglycerin-6 functions as a large-molecule humectant composed of six repeating glycerol units. By possessing a high density of hydroxyl (-OH) groups, the molecule establishes multiple hydrogen bonds with Aqua, creating a reservoir of moisture on the stratum corneum. Unlike smaller polyols, the polymerized structure remains on the skin’s surface longer, providing sustained hydration and preventing trans-epidermal water loss (TEWL) without evaporating quickly.Chemical stability is a hallmark of this ingredient, as it remains resistant to hydrolysis across a wide pH range. This robustness allows it to serve as an effective solubilizer and carrier for water-insoluble substances, ensuring that active compounds are evenly distributed throughout a formula. In surfactant systems, it helps mitigate the potential harshness of cleansing agents by preserving the integrity of the lipid barrier.Sensory characteristics are notably improved when this polyglycerol is used in place of standard Glycerin. Formulators value its ability to deliver a “cushion” feel upon application. This structural complexity results in a rich, lubricious texture that imparts a dewy appearance to the skin while facilitating the absorption of accompanying actives like Niacinamide or Panthenol.
Broader Applications & Origins
While predominantly used in high-end skincare, this ingredient is frequently utilized in the food industry as an emulsifier and humectant, which underscores its high safety profile and biocompatibility. Most commercial versions are produced through the catalytic polymerization of plant-derived Glycerin, typically sourced from rapeseed, palm, or coconut oils. In haircare, it functions as a conditioning agent that helps manage frizz by stabilizing moisture levels within the hair shaft.
Routine Integration
Synergies:
- Sodium Hyaluronate: Enhances the multi-level hydration effect by working at different depths of the skin surface.
- Ceramide Np: Works together to both attract moisture and seal it into the skin barrier.
- Propanediol: Improves the overall skin feel and reduces the dry-down time of serums.
Clinical Consensus & Safety
Dermatological evaluations by the Cosmetic Ingredient Review (CIR) Expert Panel have concluded that polyglycerols, including Polyglycerin-6, are safe for use in cosmetic products at current practice concentrations. Clinical studies indicate that it is non-sensitizing and non-irritating even when applied to compromised skin. Because of its large molecular weight and hydrophilic nature, it does not penetrate into the systemic circulation, remaining safely within the upper layers of the epidermis to perform its conditioning functions.
Is Polyglycerin-6 better than regular glycerin?
While both are excellent humectants, Polyglycerin-6 offers a more sophisticated sensory profile. It provides a smoother, less sticky application and offers longer-lasting moisture due to its larger molecular structure, making it ideal for leave-on products like essences and moisturizers.
Is this ingredient vegan-friendly?
Yes, most Polyglycerin-6 used in modern cosmetics is derived from vegetable oils. However, consumers should check with specific brands to ensure the raw materials were sourced in accordance with vegan standards.
Can Polyglycerin-6 cause breakouts?
With a comedogenic rating of 0, this ingredient is highly unlikely to clog pores or contribute to acne. It is considered an excellent moisturizing choice for individuals with oily or acne-prone skin who require hydration without heavy oils.