Ingredient review
Glycereth-20
INCI: GLYCERETH-20
A gentle, water-attracting ingredient that helps keep skin hydrated without the stickiness of plain glycerin.
In plain English
Glycereth-20 is a modified version of glycerin (a common moisturizing ingredient) that has been made more water-friendly and less sticky. It pulls moisture from the air into your skin, helping it stay soft and plump. Because it's less tacky than plain glycerin, it's often used in lightweight serums and gels.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Glycereth-20 is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Glycereth-20.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Glycereth-20 is a polyethylene glycol (PEG) derivative of glycerin, created by adding 20 ethylene oxide units to the glycerin molecule. This process makes it more water-soluble and reduces its sticky feel, while retaining its ability to attract and hold moisture.
How it works
As a humectant, Glycereth-20 draws water from the environment and deeper layers of the skin to the outer layer, increasing hydration. It also forms a thin film on the skin that helps reduce water loss, improving skin softness and smoothness.
Pros
Lightweight hydration
Glycereth-20 provides effective moisture without the heavy, sticky feel of plain glycerin, making it ideal for lightweight serums and gel-based products.
Good formulation compatibility
It blends well with other ingredients, including oils, silicones, and active compounds, so it's a versatile choice for many product types.
Cons and cautions
Potential irritation for sensitive skin
As an ethoxylated ingredient, it may cause mild irritation or stinging in people with very sensitive or compromised skin, though this is rare.
Less potent than smaller humectants
Its larger molecular size means it doesn't penetrate as deeply as glycerin, so it may not be as effective for deep hydration in very dry skin.
Best for
- People with normal to dry skin looking for lightweight hydration
- Those who find plain glycerin too sticky or tacky
Use caution if
- Individuals with known sensitivity to PEG compounds or ethoxylated ingredients
Usage tips
Safety summary
Glycereth-20 is generally recognized as safe for cosmetic use. Mild irritation is possible in sensitive individuals, but it is non-comedogenic and well-tolerated by most skin types.
Research notes
Research on Glycereth-20 is limited, but it is considered a safe and effective humectant based on its similarity to other PEG-glycerin derivatives. The CIR panel reviewed it and found no significant safety concerns at typical use levels.
Common label clues
- Typical concentration
- Typically 1–10% in leave-on products; up to 20% in rinse-off formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed it safe at concentrations up to 20%.
- Common uses
- Serums, Moisturizers, Cleansers, Toners, Hair conditioners
- Environmental note
- As a PEG derivative, it may have moderate biodegradability; however, it is not known to bioaccumulate significantly.
Good to know
- Glycereth-20 is often used in 'water-light' moisturizers and gel creams.
- It is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels.
Common questions
What is Glycereth-20 in beauty products?
Glycereth-20 is a modified version of glycerin (a common moisturizing ingredient) that has been made more water-friendly and less sticky. It pulls moisture from the air into your skin, helping it stay soft and plump. Because it's less tacky than plain glycerin, it's often used in lightweight serums and gels.
What does Glycereth-20 do in a beauty product?
As a humectant, Glycereth-20 draws water from the environment and deeper layers of the skin to the outer layer, increasing hydration. It also forms a thin film on the skin that helps reduce water loss, improving skin softness and smoothness.
Is Glycereth-20 safe for most people?
Glycereth-20 is generally recognized as safe for cosmetic use. Mild irritation is possible in sensitive individuals, but it is non-comedogenic and well-tolerated by most skin types.
Who should be careful with Glycereth-20?
Individuals with known sensitivity to PEG compounds or ethoxylated ingredients
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.