Ingredient review
C22-24 Pareth-33
INCI: C22-24 PARETH-33
A gentle synthetic emulsifier that helps create stable, creamy textures without common irritation.
In plain English
C22-24 Pareth-33 is a synthetic ingredient made from a fatty alcohol (behenyl alcohol) and ethylene oxide. In skincare, it acts as an emulsifier, meaning it helps water and oil mix together so your lotion or cream stays smooth and doesn't separate. It also has mild cleansing properties, making it useful in gentle cleansers. Because it's derived from a long-chain fatty alcohol, it's considered very mild and unlikely to cause irritation or clog pores.
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
C22-24 Pareth-33 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 C22-24 Pareth-33.
- 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
C22-24 Pareth-33 is a polyethylene glycol (PEG) ether of a mixture of synthetic C22-24 fatty alcohols. It belongs to the 'pareth' family of emulsifiers, which are known for their ability to stabilize oil-in-water emulsions.
How it works
It works by reducing the surface tension between oil and water, allowing them to blend into a stable, uniform mixture. This prevents your product from separating into watery and oily layers. In cleansers, it helps lift dirt and oil from the skin so they can be rinsed away.
Pros
Gentle on skin
Derived from a long-chain fatty alcohol, it has very low irritation potential and is unlikely to cause stinging or redness, even for sensitive skin.
Stable formulas
It helps keep oil and water mixed together, so your lotion or cream stays smooth and effective from first use to last.
Cons and cautions
Synthetic origin
It is made through chemical processing, which may not align with 'clean beauty' or natural skincare preferences.
Trace impurity concern
The ethoxylation process can create trace amounts of 1,4-dioxane, a potential contaminant. However, reputable manufacturers purify the ingredient to meet safety standards.
Best for
- People with normal to dry skin who want a stable, non-irritating moisturizer
- Anyone using cream or lotion formulas that need a reliable emulsifier
Use caution if
- Those who strictly avoid all PEG-derived ingredients for personal reasons
Usage tips
Safety summary
C22-24 Pareth-33 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. The main safety consideration is the potential for trace 1,4-dioxane, which is tightly controlled by quality manufacturing.
Research notes
Safety assessments for PEG ethers of fatty alcohols (like pareths) have been conducted by the Cosmetic Ingredient Review (CIR) panel, which found them safe for use in cosmetics when formulated to minimize 1,4-dioxane. Specific studies on C22-24 Pareth-33 are limited, but its chemical class is well-established as low-risk.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. Manufacturers must ensure low levels of 1,4-dioxane (typically below 10 ppm) per industry guidelines.
- Common uses
- Moisturizers, Cleansers, Lotions, Sunscreens
- Environmental note
- As a synthetic PEG derivative, it may not be readily biodegradable. However, its low use concentration means environmental impact is generally considered minimal.
Good to know
- The 'C22-24' refers to the chain length of the fatty alcohol used, which contributes to its mildness.
- It is often used in combination with other emulsifiers to fine-tune texture and stability.
Common questions
What is C22-24 Pareth-33 in beauty products?
C22-24 Pareth-33 is a synthetic ingredient made from a fatty alcohol (behenyl alcohol) and ethylene oxide. In skincare, it acts as an emulsifier, meaning it helps water and oil mix together so your lotion or cream stays smooth and doesn't separate. It also has mild cleansing properties, making it useful in gentle cleansers. Because it's derived from a long-chain fatty alcohol, it's considered very mild and unlikely to cause irritation or clog pores.
What does C22-24 Pareth-33 do in a beauty product?
It works by reducing the surface tension between oil and water, allowing them to blend into a stable, uniform mixture. This prevents your product from separating into watery and oily layers. In cleansers, it helps lift dirt and oil from the skin so they can be rinsed away.
Is C22-24 Pareth-33 safe for most people?
C22-24 Pareth-33 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. The main safety consideration is the potential for trace 1,4-dioxane, which is tightly controlled by quality manufacturing.
Who should be careful with C22-24 Pareth-33?
Those who strictly avoid all PEG-derived 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.