Ingredient review
PEG-40 Glyceryl Stearate
INCI: PEG-40 Glyceryl Stearate
A gentle emulsifier that keeps oil and water mixed in creams and lotions, generally well-tolerated by most skin types.
In plain English
PEG-40 Glyceryl Stearate is a helper ingredient that allows oil and water to blend together smoothly in products like moisturizers and cleansers. It is made from glycerin and stearic acid (a natural fatty acid) combined with polyethylene glycol (PEG), which makes it water-friendly. Because it is mild and low-irritating, it is commonly used in gentle skincare formulas.
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
PEG-40 Glyceryl Stearate 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 PEG-40 Glyceryl Stearate.
- 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
PEG-40 Glyceryl Stearate is a semi-synthetic emulsifier created by reacting glycerin, stearic acid, and ethylene oxide. It belongs to the PEG (polyethylene glycol) family and is widely used in cosmetics to stabilize oil-in-water emulsions.
How it works
It works by reducing the surface tension between oil and water, allowing them to mix into a stable, creamy emulsion. This prevents the product from separating and gives it a smooth, uniform texture that spreads easily on the skin.
Pros
Gentle emulsifier
PEG-40 Glyceryl Stearate is known for its low irritation potential, making it suitable for daily-use moisturizers and cleansers even on sensitive skin.
Improves product feel
It creates a smooth, non-greasy texture that helps creams and lotions absorb quickly without leaving a heavy residue.
Cons and cautions
Potential impurities
As a PEG compound, it may contain trace amounts of 1,4-dioxane or ethylene oxide if not properly purified, though reputable brands ensure these are removed.
Not for all sensitivities
In rare cases, individuals with very compromised skin barriers may experience mild stinging or irritation from PEG derivatives.
Best for
- People with normal to dry skin looking for stable moisturizers
- Those who prefer mild, non-foaming cleansers
Use caution if
- Individuals with known sensitivity to PEG compounds (rare)
Usage tips
Safety summary
PEG-40 Glyceryl Stearate is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers purify the ingredient to meet safety standards. Overall, it is low-risk for most consumers.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG glyceryl stearates and found them safe as used in cosmetics. Studies indicate low skin irritation and sensitization potential. No significant human health risks have been identified at typical exposure levels.
Common label clues
- Typical concentration
- 1–5% in leave-on products; up to 10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics by the FDA (USA) and the European Commission (EU) with no concentration restrictions for rinse-off products; leave-on products typically use up to 5%.
- Common uses
- Moisturizers, Cleansers, Sunscreens, Makeup removers
- Environmental note
- PEG compounds are generally biodegradable, but their production involves ethylene oxide, which has environmental considerations. Many brands now use purified grades to minimize ecological impact.
Good to know
- PEG-40 Glyceryl Stearate is considered safe by major regulatory bodies when used in cosmetics at typical levels.
- It is often used alongside other emulsifiers to fine-tune product consistency.
Common questions
What is PEG-40 Glyceryl Stearate in beauty products?
PEG-40 Glyceryl Stearate is a helper ingredient that allows oil and water to blend together smoothly in products like moisturizers and cleansers. It is made from glycerin and stearic acid (a natural fatty acid) combined with polyethylene glycol (PEG), which makes it water-friendly. Because it is mild and low-irritating, it is commonly used in gentle skincare formulas.
What does PEG-40 Glyceryl Stearate do in a beauty product?
It works by reducing the surface tension between oil and water, allowing them to mix into a stable, creamy emulsion. This prevents the product from separating and gives it a smooth, uniform texture that spreads easily on the skin.
Is PEG-40 Glyceryl Stearate safe for most people?
PEG-40 Glyceryl Stearate is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers purify the ingredient to meet safety standards. Overall, it is low-risk for most consumers.
Who should be careful with PEG-40 Glyceryl Stearate?
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.