Functioning as a high-performance, non-ionic emulsifier, Polyglyceryl-6 Stearate is prized for creating stable oil-in-water (O/W) emulsions with a lightweight, elegant skin feel. This plant-derived ingredient serves as an effective PEG-free alternative, offering both formula stabilization and mild skin-conditioning properties without the risk of irritation.
- INCI Name:
- Polyglyceryl-6 Stearate
- Chemical/Scientific Name:
- Hexaglyceryl monostearate; 1,2,3-Propanetriol, homopolymer, monooctadecanoate
- Common Aliases:
- Polyglyceryl-6 Monostearate, Hexaglycerol Stearate
| Category: | Emulsifiers |
| Source Origin: | Plant-derived (typically vegetable oils like rapeseed or palm) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Food, Pharmaceuticals |
| Solubility: | Dispersible in hot water and oil (HLB ~9.5) |
At a Glance: Properties & Effects
| Formula Stability: | |
| Texture Enhancement: | |
| Skin Soothing: | |
| Irritation Risk: |
Primary Benefits:
- Facilitates the creation of stable, low-viscosity lotions and fluid sprays.
- Provides a non-greasy, soft after-feel on the skin surface.
- Acts as a PEG-free (polyethylene glycol-free) surfactant, appealing to clean beauty standards.
- Enhances the distribution of lipids and emollients across the stratum corneum.
Potential Risks:
- Minimal risk; generally considered non-sensitizing and non-irritating even for sensitive skin.
Biological Action & Cosmetic Profile
Structural integrity in oil-in-water formulations is achieved through the amphiphilic nature of this molecule. By combining a hydrophilic polyglycerol backbone (six units) with a lipophilic fatty acid chain derived from Stearic Acid, the ingredient effectively lowers surface tension at the oil-water interface. This process prevents the coalescence of oil droplets, ensuring the product remains homogeneous over a wide range of temperatures and storage conditions.
Amphiphilic characteristics also contribute to the sensory profile of the finished product. Unlike traditional surfactants that may disrupt the skin’s lipid bilayer, this ester remains largely on the surface, where it helps to smooth the skin texture. Its ability to form lamellar liquid crystalline structures in the presence of co-emulsifiers like Glyceryl Stearate allows it to mimic the skin’s natural barrier organization, potentially aiding in moisture retention indirectly by reducing transepidermal water loss (TEWL).
Formulators often select this polyglyceryl ester when designing products for sensitive or reactive skin. Because it lacks the small, potentially irritating molecules often found in ethoxylated surfactants, it maintains a high safety profile. It is particularly effective in formulations containing Aqua and light emollients like Caprylic Capric Triglyceride, where it produces a “quick-break” effect upon application, releasing the water phase for an immediate cooling sensation.
Broader Applications & Origins
The manufacturing process involves the esterification of vegetable-sourced Glycerin and fatty acids. This renewable origin makes it a cornerstone of “green” chemistry. Beyond facial skincare, it is extensively used in sunscreens to help disperse physical filters like Zinc Oxide or Titanium Dioxide, ensuring even coverage and protection.
Routine Integration
Synergies:
- Cetearyl Alcohol: Works as a co-emulsifier to increase the viscosity and “body” of creams.
- Glyceryl Stearate: Often paired together in commercial blends (such as Dermofeel PS) to create highly stable, fine-droplet emulsions.
- Xanthan Gum: Helps stabilize the external water phase, preventing sedimentation in fluid formulations.
Clinical Consensus & Safety
Dermatological assessments conducted by the Cosmetic Ingredient Review (CIR) Expert Panel conclude that polyglyceryl fatty acid esters, including the stearate variety, are safe for use in cosmetics. They are classified as non-sensitizing and exhibit very low potential for ocular or dermal irritation. Clinical studies on similar esters show no evidence of phototoxicity or mutagenicity. Because the human body can metabolize these esters into Glycerin and Stearic Acid, both of which occur naturally in the skin, the physiological compatibility is exceptionally high.
Is Polyglyceryl-6 Stearate safe for acne-prone skin?
Yes. With a comedogenic rating of 0, this ingredient is unlikely to clog pores. It is frequently used in oil-free or lightweight moisturizers designed for oily and acne-prone skin types.
Is this ingredient vegan and natural?
Typically, yes. It is almost exclusively derived from vegetable sources such as palm, coconut, or rapeseed oil. However, consumers should check for RSPO certification if they are concerned about the environmental impact of palm-derived ingredients.
How does it differ from Polyglyceryl-10 Stearate?
The number refers to the length of the polyglycerol chain. While Polyglyceryl 10 Stearate is more hydrophilic and suitable for cleansing oils, the 6-stearate version is more balanced, making it superior for stabilizing traditional lotions and creams.