Ingredient review
PEG-5 Glyceryl Tristearate
INCI: PEG-5 Glyceryl Tristearate
A reliable synthetic emulsifier that helps creams and lotions feel smooth and stable, but it offers no direct skin benefit.
In plain English
PEG-5 Glyceryl Tristearate is a man-made ingredient that helps oil and water mix together in your skincare products. Without emulsifiers like this, creams and lotions would separate into oily and watery layers. It also helps the product spread easily on your skin and gives it a nice, non-greasy feel. While it doesn't actively improve your skin, it plays a key supporting role in making the formula work well.
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-5 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-5 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 compound made by attaching five ethylene oxide units (PEG-5) to glyceryl tristearate, a fat derived from stearic acid. It belongs to the PEG (polyethylene glycol) family of emulsifiers.
How it works
It reduces the surface tension between oil and water, allowing them to form a stable, uniform mixture. This prevents your cream or lotion from separating and helps it apply smoothly without feeling heavy or greasy.
Pros
Stable formulas
Helps keep your cream or lotion from separating, so you get a consistent texture every time you use it.
Smooth application
Makes products spread easily and feel light on the skin, without a greasy residue.
Cons and cautions
No skin benefit
It's purely a functional ingredient—it doesn't hydrate, soothe, or actively improve your skin.
Synthetic origin
Made in a lab, which may be a turn-off if you prefer naturally derived or minimal-ingredient products.
Best for
- Anyone using standard creams or lotions
- People who prefer stable, well-formulated products
Use caution if
- Those avoiding all synthetic or PEG-based ingredients
Usage tips
Safety summary
PEG-5 Glyceryl Tristearate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. As with all PEGs, there is a theoretical concern about impurities, but cosmetic-grade material is purified to meet safety standards.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG compounds and found them safe for use in cosmetics. No specific studies on PEG-5 Glyceryl Tristearate were identified, but its safety profile is consistent with similar PEG emulsifiers.
Common label clues
- Typical concentration
- 1–5%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and the EU Cosmetics Regulation, with no concentration restrictions.
- Common uses
- Moisturizers, Creams, Lotions, Sunscreens
- Environmental note
- PEG compounds are generally biodegradable, but their production relies on petrochemicals, which have a higher environmental footprint than some plant-based alternatives.
Good to know
- PEG compounds can sometimes contain trace impurities like ethylene oxide or 1,4-dioxane, but reputable manufacturers purify them to safe levels.
- This ingredient is not the same as pure PEG—it's a larger molecule that is less likely to penetrate the skin.
Common questions
What is PEG-5 Glyceryl Tristearate in beauty products?
PEG-5 Glyceryl Tristearate is a man-made ingredient that helps oil and water mix together in your skincare products. Without emulsifiers like this, creams and lotions would separate into oily and watery layers. It also helps the product spread easily on your skin and gives it a nice, non-greasy feel. While it doesn't actively improve your skin, it plays a key supporting role in making the formula work well.
What does PEG-5 Glyceryl Tristearate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to form a stable, uniform mixture. This prevents your cream or lotion from separating and helps it apply smoothly without feeling heavy or greasy.
Is PEG-5 Glyceryl Tristearate safe for most people?
PEG-5 Glyceryl Tristearate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. As with all PEGs, there is a theoretical concern about impurities, but cosmetic-grade material is purified to meet safety standards.
Who should be careful with PEG-5 Glyceryl Tristearate?
Those avoiding all 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.