Ingredient review
PPG-2 C9-11 Pareth-5
INCI: PPG-2 C9-11 Pareth-5
A synthetic emulsifier that helps mix oil and water, but may be mildly drying or irritating for sensitive skin.
In plain English
This is a man-made ingredient that helps oil and water stay blended in products like cleansers and lotions. It works by reducing surface tension so that ingredients that normally don't mix can combine into a smooth, stable formula. While effective, it can sometimes strip natural oils from the skin, especially in high concentrations or with frequent use.
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 moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PPG-2 C9-11 Pareth-5 can be useful, but watch for some irritation potential.
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 PPG-2 C9-11 Pareth-5.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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
PPG-2 C9-11 Pareth-5 is a synthetic ethoxylated alcohol surfactant. It belongs to the alkyl polyglycol ether family and is created by reacting a fatty alcohol (C9-11) with propylene oxide and ethylene oxide. It acts as a non-ionic surfactant, meaning it doesn't carry an electrical charge, which makes it gentle enough for many rinse-off products.
How it works
In a cosmetic formula, this ingredient sits at the interface between oil and water molecules. Its water-loving (hydrophilic) end attaches to water, while its oil-loving (lipophilic) end attaches to oils and dirt. This action allows it to lift away excess oil, makeup, and impurities from the skin or hair, and then rinse away cleanly with water.
Pros
Effective emulsifier
Helps oil and water blend smoothly, improving product texture and stability without needing multiple ingredients.
Good for rinse-off formulas
Works well in cleansers and shampoos to remove oil and dirt without leaving a heavy residue.
Cons and cautions
Potential for mild irritation
In high concentrations or on sensitive skin, it can strip natural oils and cause tightness or dryness.
Ethoxylation concerns
The manufacturing process may create trace amounts of 1,4-dioxane, a contaminant that some consumers prefer to avoid.
Best for
- People with normal to oily skin looking for effective cleansing
- Those who use rinse-off products like shampoos and body washes
Use caution if
- Individuals with very dry, sensitive, or eczema-prone skin may want to avoid high concentrations in leave-on products
Usage tips
Safety summary
Generally considered safe for use in rinse-off cosmetics at typical concentrations. The main concern is potential irritation for sensitive skin and trace contamination from the ethoxylation process. Regulatory bodies set limits to keep 1,4-dioxane levels very low.
Research notes
Studies show that ethoxylated alcohols like this one are effective surfactants with low acute toxicity. Research on skin irritation is mixed, with some reports of mild irritation at higher concentrations. The Cosmetic Ingredient Review panel has deemed similar ingredients safe when formulated to minimize 1,4-dioxane.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with concentration limits in some leave-on products to minimize 1,4-dioxane exposure.
- Common uses
- Cleansers, Shampoos, Body washes, Makeup removers, Lotions
- Environmental note
- As a synthetic ethoxylate, it may have moderate biodegradability. Some consumers prefer plant-derived alternatives for lower environmental impact.
Good to know
- This ingredient is often found in sulfate-free cleansers as a milder alternative to sodium lauryl sulfate.
- The 'PPG-2' part refers to the propylene glycol chain length, which affects its solubility and mildness.
Common questions
What is PPG-2 C9-11 Pareth-5 in beauty products?
This is a man-made ingredient that helps oil and water stay blended in products like cleansers and lotions. It works by reducing surface tension so that ingredients that normally don't mix can combine into a smooth, stable formula. While effective, it can sometimes strip natural oils from the skin, especially in high concentrations or with frequent use.
What does PPG-2 C9-11 Pareth-5 do in a beauty product?
In a cosmetic formula, this ingredient sits at the interface between oil and water molecules. Its water-loving (hydrophilic) end attaches to water, while its oil-loving (lipophilic) end attaches to oils and dirt. This action allows it to lift away excess oil, makeup, and impurities from the skin or hair, and then rinse away cleanly with water.
Is PPG-2 C9-11 Pareth-5 safe for most people?
Generally considered safe for use in rinse-off cosmetics at typical concentrations. The main concern is potential irritation for sensitive skin and trace contamination from the ethoxylation process. Regulatory bodies set limits to keep 1,4-dioxane levels very low.
Who should be careful with PPG-2 C9-11 Pareth-5?
Individuals with very dry, sensitive, or eczema-prone skin may want to avoid high concentrations in leave-on products
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.