Best For Skin Types
All, Dry, Combination
Addresses
Usage Frequency
Daily
What Is PEG-6?
PEG-6 is a polyethylene glycol—a synthetic polymer derived from ethylene oxide. It functions as both a humectant (drawing moisture into the skin) and a solvent (helping dissolve and stabilise other ingredients in a formula). It appears in roughly 0.2% of skincare products, typically in small concentrations as a supporting ingredient rather than a primary active.
As a humectant, PEG-6 works by attracting water molecules to the skin's surface. As a solvent, it enables better mixing of water-loving and oil-loving ingredients, which helps formulations remain stable and allows active ingredients to penetrate more effectively.
How It Works
PEG-6 is hygroscopic, meaning it has an affinity for water and will absorb moisture from both the environment and deeper skin layers, drawing it towards the surface. This hydrating action supports the skin's natural moisture balance, particularly useful in drier or dehydrated states.
As a solvent, PEG-6 dissolves readily in both water and oils, making it a useful bridge between incompatible ingredients. This property allows formulators to create stable, homogeneous products and can enhance the skin penetration of active ingredients that might otherwise struggle to reach viable skin layers.
Clinical Evidence & References
Research into PEGs and their derivatives suggests they can influence how other skincare actives (such as niacinamide) are delivered into the skin, though results vary depending on what other solvents are used alongside PEG-6. The ingredient has a long history of use in cosmetics and pharmaceuticals with an established safety profile.
Evidence specific to PEG-6 as a standalone humectant is limited in the published literature. Most efficacy data relates to PEGs in combination with other ingredients or in specific delivery systems, so broader claims about its hydrating capacity should be treated with appropriate caution.
Published Research
How to Use
PEG-6 is not typically the main active in a product; it works best as part of a formulation with complementary humectants (such as glycerin) and actives. Apply products containing PEG-6 to clean, damp skin to maximise its water-attracting properties. Use consistently as directed, usually twice daily as part of your routine.
Safety & Precautions
Frequently Asked Questions
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PEG-6 is a variant of PEG-75, the form you will most often see on an ingredients list.
Functions as a humectant to boost skin’s hydration | May also be used as a solvent to mesh ingredients cohesively and enhance formulary texture
Related Ingredients
PEG-75
Functions as a humectant to boost skin’s hydration | May also be used as a solvent to mesh ingredients cohesively and enhance formulary texture
PEG-4
Type of polyethylene glycol | Used as a humectant and solvent in cosmetics
PEG-14
Functions as a humectant to increase skin’s hydration | May also be used as a solvent to mesh ingredients cohesively
PEG-20
A versatile polymer that helps formulations blend and retain moisture
PEG-7m
A synthetic polymer that stabilises formulations and controls texture
PEG-60
A synthetic humectant and solvent that draws moisture into the skin and aids product formulation
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