Ingredient review
Glycereth-3
INCI: GLYCERETH-3
A reliable, low-irritation humectant that hydrates without stickiness, ideal for sensitive and dry skin types.
In plain English
Glycereth-3 is a modified form of glycerin that has been made more water-friendly by adding a small number of ethylene oxide units. This tweak helps it spread easily in water-based formulas and reduces the sticky feel that plain glycerin can sometimes leave on the skin. It works by pulling moisture from the air into the outer layer of your skin, keeping it soft and hydrated.
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-3 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-3.
- 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-3 is a semi-synthetic humectant created by reacting glycerin with ethylene oxide. It belongs to the alkoxylated glycerin family and is commonly used in cosmetics to improve moisture retention and product texture.
How it works
Glycereth-3 attracts water molecules from the environment and binds them to the skin's surface, increasing hydration. Its ethoxylated structure also helps it mix easily with other ingredients, making formulas feel lighter and less tacky than plain glycerin.
Pros
Lightweight hydration
Glycereth-3 hydrates without the heavy, tacky residue that plain glycerin can leave, making it ideal for daytime use under makeup or sunscreen.
Gentle on skin
With a low irritation and comedogenic risk, it's suitable for sensitive and acne-prone skin types that need moisture without clogging pores.
Cons and cautions
Semi-synthetic origin
The ethoxylation process uses ethylene oxide, which can be a concern for those seeking fully natural ingredients, though residual levels in finished products are tightly controlled.
Limited standalone efficacy
As a humectant, it works best when paired with occlusives (like oils or shea butter) to lock in moisture; used alone, it may not prevent water loss in very dry environments.
Best for
- People with dry or dehydrated skin
- Those who find plain glycerin too sticky
- Sensitive skin types looking for a gentle humectant
Use caution if
- Individuals with known allergy to ethoxylated ingredients (very rare)
Usage tips
Safety summary
Glycereth-3 is well-tolerated by most skin types with a low risk of irritation or clogged pores. The ethoxylation process is safe when properly purified, and regulatory bodies consider it safe at typical cosmetic levels.
Research notes
Studies on ethoxylated glycerins indicate they are effective humectants with low skin irritation potential. The Cosmetic Ingredient Review (CIR) expert panel reviewed similar ingredients and concluded they are safe for use in cosmetics at concentrations up to 10%.
Common label clues
- Typical concentration
- 1% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the EU, US FDA (as part of cosmetic ingredients), and Health Canada. The Cosmetic Ingredient Review panel has deemed it safe at concentrations up to 10%.
- Common uses
- Serums, Moisturizers, Cleansers, Toners
- Environmental note
- Ethoxylated ingredients may have environmental persistence concerns, but Glycereth-3 is used in low concentrations and is generally considered low-risk in rinse-off products.
Good to know
- Glycereth-3 is often used in 'water-light' moisturizers and serums for its non-sticky finish.
- It is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels.
Common questions
What is Glycereth-3 in beauty products?
Glycereth-3 is a modified form of glycerin that has been made more water-friendly by adding a small number of ethylene oxide units. This tweak helps it spread easily in water-based formulas and reduces the sticky feel that plain glycerin can sometimes leave on the skin. It works by pulling moisture from the air into the outer layer of your skin, keeping it soft and hydrated.
What does Glycereth-3 do in a beauty product?
Glycereth-3 attracts water molecules from the environment and binds them to the skin's surface, increasing hydration. Its ethoxylated structure also helps it mix easily with other ingredients, making formulas feel lighter and less tacky than plain glycerin.
Is Glycereth-3 safe for most people?
Glycereth-3 is well-tolerated by most skin types with a low risk of irritation or clogged pores. The ethoxylation process is safe when properly purified, and regulatory bodies consider it safe at typical cosmetic levels.
Who should be careful with Glycereth-3?
Individuals with known allergy to ethoxylated ingredients (very 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.