Ingredient review
PEG-2 Stearate
INCI: PEG-2 Stearate
PEG-2 Stearate is a reliable emulsifier that keeps creams and lotions stable, but it may be moderately comedogenic for acne-prone skin.
In plain English
PEG-2 Stearate is a man-made ingredient that helps oil and water mix together in your skincare products. Without it, many creams and lotions would separate into a watery layer and an oily layer. It is part of a family of ingredients called PEGs (polyethylene glycols), which are widely used in cosmetics. While generally safe, some people find that products with this ingredient can feel a bit heavy or may clog pores, especially if you have oily or acne-prone skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is low; clogging risk is moderate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- moderate
Quick decision guide
Useful, but context matters
PEG-2 Stearate can be useful, but watch for possible clogging concerns.
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-2 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
moderateMay be fine for many users but deserves caution if you are breakout-prone.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
PEG-2 Stearate is a synthetic compound made by combining stearic acid (a fatty acid found in plants and animals) with ethylene oxide. It belongs to the PEG (polyethylene glycol) family and acts as an emulsifier and surfactant.
How it works
In a cosmetic formula, PEG-2 Stearate sits at the boundary between oil and water droplets, reducing surface tension so they can mix into a stable, smooth emulsion. This prevents your cream or lotion from separating and gives it a consistent texture.
Pros
Effective emulsifier
PEG-2 Stearate reliably blends oil and water, giving creams and lotions a smooth, uniform texture that doesn't separate over time.
Gentle for most skin
It has a low irritation risk and is well-tolerated by most skin types, making it a common choice in everyday moisturizers.
Cons and cautions
Moderate comedogenic potential
Some users, especially those with acne-prone skin, may find that products with PEG-2 Stearate feel heavy or contribute to clogged pores.
Synthetic origin
As a synthetic PEG compound, it may be less appealing to those seeking natural or minimal-ingredient skincare, and manufacturing can introduce trace impurities if not properly purified.
Best for
- People with normal to dry skin who use rich creams and lotions
- Anyone looking for a stable, affordable emulsifier in their skincare routine
Use caution if
- Those with very oily or acne-prone skin, as it may contribute to clogged pores
Usage tips
Safety summary
PEG-2 Stearate is considered safe for cosmetic use at typical concentrations. The main concern is its moderate comedogenic rating, which may affect acne-prone individuals. Overall, it has a low irritation risk and a long history of safe use.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG stearates and found them safe as used in cosmetics. Studies indicate low acute toxicity and skin irritation, though individual sensitivity can vary. No significant systemic risks have been identified.
Common label clues
- Typical concentration
- Usually 1–5% of the formula
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with no concentration restrictions in leave-on or rinse-off products.
- Common uses
- Creams, Lotions, Makeup removers, Hair conditioners
- Environmental note
- PEG compounds are generally biodegradable, but their production involves ethylene oxide, which is a hazardous chemical. Responsible manufacturers use purification steps to minimize impurities.
Good to know
- PEG-2 Stearate is often used alongside other emulsifiers to create a more stable formula.
- The number '2' refers to the average length of the PEG chain, which affects how water-loving or oil-loving the ingredient is.
Common questions
What is PEG-2 Stearate in beauty products?
PEG-2 Stearate is a man-made ingredient that helps oil and water mix together in your skincare products. Without it, many creams and lotions would separate into a watery layer and an oily layer. It is part of a family of ingredients called PEGs (polyethylene glycols), which are widely used in cosmetics. While generally safe, some people find that products with this ingredient can feel a bit heavy or may clog pores, especially if you have oily or acne-prone skin.
What does PEG-2 Stearate do in a beauty product?
In a cosmetic formula, PEG-2 Stearate sits at the boundary between oil and water droplets, reducing surface tension so they can mix into a stable, smooth emulsion. This prevents your cream or lotion from separating and gives it a consistent texture.
Is PEG-2 Stearate safe for most people?
PEG-2 Stearate is considered safe for cosmetic use at typical concentrations. The main concern is its moderate comedogenic rating, which may affect acne-prone individuals. Overall, it has a low irritation risk and a long history of safe use.
Who should be careful with PEG-2 Stearate?
Those with very oily or acne-prone skin, as it may contribute to clogged pores
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.