Ingredient review
Glycereth-12
INCI: Glycereth-12
Glycereth-12 is a reliable, non-sticky humectant that hydrates the skin without the tackiness of plain glycerin, making it a great choice for lightweight formulas.
In plain English
Glycereth-12 is a modified version of glycerin, a natural moisturizing ingredient. By adding ethylene oxide units (the 'eth' part), it becomes less sticky and more spreadable, so it feels lighter on the skin. It works by pulling water from the air and deeper layers of your skin to the surface, keeping your skin hydrated and plump. You'll often find it in serums and moisturizers where a silky, non-greasy feel is desired.
Review score
Safety, usefulness, and evidence
Strong fit for many routines
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
Easy yes for most routines
Glycereth-12 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-12.
- 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-12 is a polyethylene glycol (PEG) derivative of glycerin. It is a clear, viscous liquid that is water-soluble and used primarily as a humectant in cosmetics. The number '12' indicates the average number of ethylene oxide units added, which determines its properties like viscosity and moisture-binding capacity.
How it works
Glycereth-12 attracts water molecules from the environment and the lower layers of the skin (dermis) to the outer layer (stratum corneum). This increases the water content in the skin's surface, reducing dryness and improving the appearance of fine lines. Its larger molecular size compared to plain glycerin means it stays on the skin's surface longer, providing sustained hydration without evaporating quickly.
Pros
Non-sticky hydration
Unlike plain glycerin, Glycereth-12 provides moisture without leaving a tacky residue, making it ideal for daytime serums and lightweight moisturizers.
Gentle on skin
It has a low irritation and comedogenic risk, so even those with sensitive or acne-prone skin can typically use it without issues.
Cons and cautions
Synthetic origin
Glycereth-12 is made through ethoxylation, a chemical process that uses ethylene oxide, which may be a concern for those seeking fully natural ingredients.
Potential tackiness at high levels
In formulas with concentrations above 10%, some users may notice a slight sticky feel, though this is less pronounced than with glycerin.
Best for
- People with dry or dehydrated skin looking for lightweight hydration
- Those who find plain glycerin too sticky or heavy
Use caution if
- Individuals with known sensitivity to PEG compounds (rare)
Usage tips
Safety summary
Glycereth-12 is considered safe for cosmetic use with a low risk of irritation or clogging pores. It is well-tolerated by most skin types, including sensitive skin. The main concern is its synthetic origin, which may not align with 'clean beauty' preferences, but no significant health risks have been identified at typical usage levels.
Research notes
Research on Glycereth-12 specifically is limited, but it is a well-established humectant in the cosmetics industry. Its safety has been reviewed by the CIR panel, which concluded it is safe as used. Studies on similar ethoxylated glycerins show effective moisture retention with low irritation potential.
Common label clues
- Typical concentration
- 1–5% in leave-on products; up to 10% in rinse-off formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. The Cosmetic Ingredient Review (CIR) panel has deemed it safe at concentrations up to 10% in leave-on products.
- Common uses
- Serums, Moisturizers, Cleansers, Toners
- Environmental note
- As a PEG derivative, Glycereth-12 is not biodegradable in all conditions, but it is not known to bioaccumulate. Some consumers prefer plant-derived alternatives for environmental reasons.
Good to know
- Glycereth-12 is often used as a replacement for glycerin in 'non-sticky' or 'lightweight' formulas.
- It is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels.
Common questions
What is Glycereth-12 in beauty products?
Glycereth-12 is a modified version of glycerin, a natural moisturizing ingredient. By adding ethylene oxide units (the 'eth' part), it becomes less sticky and more spreadable, so it feels lighter on the skin. It works by pulling water from the air and deeper layers of your skin to the surface, keeping your skin hydrated and plump. You'll often find it in serums and moisturizers where a silky, non-greasy feel is desired.
What does Glycereth-12 do in a beauty product?
Glycereth-12 attracts water molecules from the environment and the lower layers of the skin (dermis) to the outer layer (stratum corneum). This increases the water content in the skin's surface, reducing dryness and improving the appearance of fine lines. Its larger molecular size compared to plain glycerin means it stays on the skin's surface longer, providing sustained hydration without evaporating quickly.
Is Glycereth-12 safe for most people?
Glycereth-12 is considered safe for cosmetic use with a low risk of irritation or clogging pores. It is well-tolerated by most skin types, including sensitive skin. The main concern is its synthetic origin, which may not align with 'clean beauty' preferences, but no significant health risks have been identified at typical usage levels.
Who should be careful with Glycereth-12?
Individuals with known sensitivity to PEG compounds (rare)
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.