Ingredient review
PEG-15 Glyceryl Tristearate
INCI: PEG-15 Glyceryl Tristearate
A reliable synthetic emulsifier that helps create smooth, stable creams and lotions with a low risk of irritation.
In plain English
PEG-15 Glyceryl Tristearate is a man-made ingredient that helps oil and water mix together in skincare products. Without emulsifiers like this, creams and lotions would separate into watery and oily layers. It is made by attaching 15 units of polyethylene glycol (PEG) to a fat molecule derived from stearic acid, which is a common fatty acid found in cocoa butter and shea butter. This ingredient is widely used because it is gentle on skin and helps create a smooth, even texture.
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PEG-15 Glyceryl Tristearate 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-15 Glyceryl Tristearate.
- 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
A synthetic emulsifier created by reacting polyethylene glycol (PEG) with glyceryl tristearate, a fat derived from stearic acid. It belongs to the PEG family of emulsifiers, which are known for their ability to stabilize oil-in-water emulsions.
How it works
It reduces the surface tension between oil and water, allowing them to blend into a stable, uniform mixture. This prevents products from separating and gives them a creamy, spreadable consistency. It also helps other ingredients disperse evenly across the skin.
Pros
Gentle on skin
PEG-15 Glyceryl Tristearate has a low irritation risk, making it suitable for sensitive skin types and daily-use products.
Improves product texture
It helps create smooth, non-greasy creams and lotions that spread easily and feel pleasant on the skin.
Cons and cautions
Synthetic origin
It is a man-made ingredient, which may be a drawback for consumers seeking natural or plant-based skincare.
Potential for trace impurities
PEG compounds can sometimes contain trace amounts of ethylene oxide or 1,4-dioxane if not properly purified, though reputable manufacturers ensure high purity.
Best for
- Anyone using cream or lotion-based skincare products
- People with sensitive skin who need gentle, non-irritating formulas
Use caution if
- Those who strictly avoid synthetic or PEG-based ingredients
Usage tips
Safety summary
PEG-15 Glyceryl Tristearate is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace impurities like 1,4-dioxane, which is minimized through good manufacturing practices. Regulatory bodies including the CIR and the European Commission have approved its use.
Research notes
Research on PEG emulsifiers is well-established, with decades of safe use in cosmetics. Studies focus on their ability to stabilize emulsions and their low skin irritation potential. No significant safety concerns have been raised for properly purified PEG-15 Glyceryl Tristearate.
Common label clues
- Typical concentration
- Typically 0.5–5% of the formula
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has reviewed PEG compounds and found them safe when formulated to meet purity standards.
- Common uses
- Moisturizers, Cleansers, Sunscreens, Makeup removers
- Environmental note
- PEG compounds are generally biodegradable, but their production relies on petrochemicals. Some environmental concerns exist regarding the persistence of certain PEG derivatives in aquatic systems.
Good to know
- PEG numbers (like 15) indicate the average number of ethylene glycol units, which affects how water-loving or oil-loving the molecule is.
- This ingredient is not absorbed significantly through the skin and is considered safe at typical cosmetic concentrations.
Common questions
What is PEG-15 Glyceryl Tristearate in beauty products?
PEG-15 Glyceryl Tristearate is a man-made ingredient that helps oil and water mix together in skincare products. Without emulsifiers like this, creams and lotions would separate into watery and oily layers. It is made by attaching 15 units of polyethylene glycol (PEG) to a fat molecule derived from stearic acid, which is a common fatty acid found in cocoa butter and shea butter. This ingredient is widely used because it is gentle on skin and helps create a smooth, even texture.
What does PEG-15 Glyceryl Tristearate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to blend into a stable, uniform mixture. This prevents products from separating and gives them a creamy, spreadable consistency. It also helps other ingredients disperse evenly across the skin.
Is PEG-15 Glyceryl Tristearate safe for most people?
PEG-15 Glyceryl Tristearate is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace impurities like 1,4-dioxane, which is minimized through good manufacturing practices. Regulatory bodies including the CIR and the European Commission have approved its use.
Who should be careful with PEG-15 Glyceryl Tristearate?
Those who strictly avoid synthetic or PEG-based 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.