Ingredient review

PEG-5 Rapeseed Sterol

INCI: PEG-5 RAPESEED STEROL

A mild, plant-derived emulsifier that helps blend water and oil in creams and lotions while leaving skin feeling smooth.

beautyskincareemulsifier

In plain English

PEG-5 Rapeseed Sterol is a semi-synthetic ingredient made by attaching a small PEG chain to sterols from rapeseed oil. In skincare, it acts as an emulsifier, meaning it helps water and oil mix together so your cream or lotion stays smooth and doesn't separate. It also has mild skin-conditioning properties, leaving a soft, non-greasy feel. Because it's derived from a plant source and has a low irritation profile, it's often used in gentle formulations for sensitive skin.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

PEG-5 Rapeseed Sterol 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging PEG-5 Rapeseed Sterol.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A semi-synthetic emulsifier created by ethoxylating sterols extracted from rapeseed (canola) oil. The PEG (polyethylene glycol) portion makes it water-friendly, while the sterol portion is oil-friendly, allowing it to stabilize water-and-oil blends.

How it works

It positions itself at the interface between water and oil droplets in a formula, reducing surface tension so the two phases stay mixed. This prevents separation and gives the product a uniform, creamy texture. Additionally, the sterol part can interact with the skin's lipid barrier, providing a light conditioning effect.

Pros

Gentle on skin

PEG-5 Rapeseed Sterol has a low irritation risk, making it a good choice for sensitive skin formulas that need a stable emulsion.

Improves product texture

It helps creams and lotions feel smooth and lightweight without leaving a heavy or sticky residue, enhancing the user experience.

Cons and cautions

Semi-synthetic origin

Because it's processed with PEG, it may not appeal to consumers seeking fully natural or unprocessed ingredients.

Potential trace impurities

Like all PEG compounds, there is a theoretical risk of 1,4-dioxane contamination, though reputable manufacturers keep levels well within safety limits.

Best for

  • Anyone looking for a gentle, non-irritating emulsifier in their moisturizer or serum
  • People with sensitive or reactive skin who want a stable cream without harsh surfactants

Use caution if

  • Those who strictly avoid PEG-derived ingredients due to personal preference or ethical sourcing concerns

Usage tips

Use in the oil phase of your formulation for best emulsification results
Combine with a co-emulsifier like cetearyl alcohol for thicker, more stable creams
Store in a cool, dry place away from direct sunlight to maintain stability

Safety summary

PEG-5 Rapeseed Sterol is considered safe for topical use at typical concentrations. It has low irritation and comedogenic potential. As with all PEGs, quality control ensures minimal impurities. No significant safety concerns have been reported in cosmetic use.

Research notes

While specific studies on PEG-5 Rapeseed Sterol are limited, the safety of PEG compounds and plant sterols in cosmetics is well-established. Regulatory bodies like the Cosmetic Ingredient Review (CIR) have reviewed similar PEG sterols and found them safe for use. The ingredient functions primarily as an emulsifier with mild conditioning benefits.

Common label clues

Typical concentration
0.5% to 3%
Regulatory status
Approved for use in cosmetics in the EU, US, and other major markets. The PEG chain length (5) is considered low-risk, and the ingredient is generally recognized as safe when used as directed.
Common uses
Moisturizers, Serums, Creams, Lotions
Environmental note
Rapeseed is a widely cultivated crop, and using its sterols helps reduce waste. However, the PEG processing involves synthetic chemistry, which has a moderate environmental footprint.

Good to know

  • Rapeseed sterols are a byproduct of rapeseed oil production, making this ingredient a good example of upcycling in cosmetics
  • PEG-5 Rapeseed Sterol is often listed near the middle or end of an ingredient list because it's used at low concentrations

Common questions

What is PEG-5 Rapeseed Sterol in beauty products?

PEG-5 Rapeseed Sterol is a semi-synthetic ingredient made by attaching a small PEG chain to sterols from rapeseed oil. In skincare, it acts as an emulsifier, meaning it helps water and oil mix together so your cream or lotion stays smooth and doesn't separate. It also has mild skin-conditioning properties, leaving a soft, non-greasy feel. Because it's derived from a plant source and has a low irritation profile, it's often used in gentle formulations for sensitive skin.

What does PEG-5 Rapeseed Sterol do in a beauty product?

It positions itself at the interface between water and oil droplets in a formula, reducing surface tension so the two phases stay mixed. This prevents separation and gives the product a uniform, creamy texture. Additionally, the sterol part can interact with the skin's lipid barrier, providing a light conditioning effect.

Is PEG-5 Rapeseed Sterol safe for most people?

PEG-5 Rapeseed Sterol is considered safe for topical use at typical concentrations. It has low irritation and comedogenic potential. As with all PEGs, quality control ensures minimal impurities. No significant safety concerns have been reported in cosmetic use.

Who should be careful with PEG-5 Rapeseed Sterol?

Those who strictly avoid PEG-derived ingredients due to personal preference or ethical sourcing concerns

Research sources

Cosmetic Ingredient Review (CIR) - Safety of PEGsOpenEuropean Chemicals Agency (ECHA) - PEG-5 Rapeseed SterolOpenPubMed - Plant Sterols in CosmeticsOpen

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.