Ingredient review
PEG-150 Distearate
INCI: PEG-150 Distearate
A gentle synthetic thickener and stabilizer that helps create smooth, creamy textures without common irritation concerns.
In plain English
PEG-150 Distearate is a synthetic ingredient made from polyethylene glycol (PEG) and stearic acid (a fatty acid from plant or animal sources). In skincare, it acts like a helper that thickens watery formulas into rich creams and helps oil and water mix together so they don't separate. It's very mild on skin and is widely used in everything from body lotions to shampoos.
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-150 Distearate 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-150 Distearate.
- 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 polymer made by reacting polyethylene glycol (PEG) with stearic acid. It belongs to a family of ingredients called PEG esters, which are known for their ability to thicken and stabilize water-based formulas.
How it works
When added to water, PEG-150 Distearate forms a gel-like network that increases the thickness (viscosity) of the product. It also acts as an emulsifier, meaning it helps tiny droplets of oil stay evenly dispersed in water, preventing the product from separating into layers. This gives lotions and creams their smooth, uniform texture.
Pros
Gentle on skin
PEG-150 Distearate has a very low irritation and comedogenic rating, making it safe for sensitive and acne-prone skin types.
Improves product texture
It gives lotions and creams a smooth, luxurious feel without leaving a heavy or sticky residue, enhancing the user experience.
Cons and cautions
Synthetic origin
As a PEG compound, it is fully synthetic, which may not appeal to those seeking natural or minimal-ingredient routines.
Potential trace impurities
Like all PEGs, manufacturing can produce trace levels of ethylene oxide or 1,4-dioxane, though reputable brands use purified grades that meet safety limits.
Best for
- Anyone looking for a gentle, non-irritating thickener in their moisturizer or cleanser
- People with sensitive or reactive skin who want stable, creamy formulas without harsh emulsifiers
Use caution if
- Those who prefer to avoid all synthetic or PEG-based ingredients for personal reasons
Usage tips
Safety summary
PEG-150 Distearate is considered safe for cosmetic use by major regulatory bodies. It has very low skin irritation and allergy potential. The main concern is the possible presence of manufacturing impurities, but these are tightly controlled in high-quality ingredients.
Research notes
The Cosmetic Ingredient Review (CIR) panel reviewed PEG-150 Distearate and concluded it is safe in current usage patterns. No significant human or animal studies indicate toxicity or irritation at typical cosmetic concentrations.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has deemed PEG-150 Distearate safe as used in rinse-off and leave-on products at concentrations up to 25%.
- Common uses
- Creams, Lotions, Cleansers, Shampoos, Conditioners
- Environmental note
- PEG compounds are generally biodegradable, but their production relies on petrochemicals. Some manufacturers are exploring bio-based PEG alternatives to reduce environmental impact.
Good to know
- PEG numbers (like 150) refer to the polymer chain length; longer chains generally mean better thickening ability.
- This ingredient is often combined with other emulsifiers to create a stable, multi-purpose base for creams and lotions.
Common questions
What is PEG-150 Distearate in beauty products?
PEG-150 Distearate is a synthetic ingredient made from polyethylene glycol (PEG) and stearic acid (a fatty acid from plant or animal sources). In skincare, it acts like a helper that thickens watery formulas into rich creams and helps oil and water mix together so they don't separate. It's very mild on skin and is widely used in everything from body lotions to shampoos.
What does PEG-150 Distearate do in a beauty product?
When added to water, PEG-150 Distearate forms a gel-like network that increases the thickness (viscosity) of the product. It also acts as an emulsifier, meaning it helps tiny droplets of oil stay evenly dispersed in water, preventing the product from separating into layers. This gives lotions and creams their smooth, uniform texture.
Is PEG-150 Distearate safe for most people?
PEG-150 Distearate is considered safe for cosmetic use by major regulatory bodies. It has very low skin irritation and allergy potential. The main concern is the possible presence of manufacturing impurities, but these are tightly controlled in high-quality ingredients.
Who should be careful with PEG-150 Distearate?
Those who prefer to avoid all synthetic or PEG-based ingredients for personal reasons
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.