Ingredient review
Oleth-106
INCI: OLETH-106
Oleth-106 is a synthetic emulsifier that helps blend oil and water in products, but it may not be ideal for very sensitive skin due to potential ethoxylate-related impurities.
In plain English
Oleth-106 is a man-made ingredient that helps oil and water mix together in creams and lotions. It's part of a family of ingredients called ethoxylates, which are made by adding ethylene oxide to fatty alcohols. While it's generally considered safe, the manufacturing process can sometimes leave behind tiny traces of impurities like 1,4-dioxane, which is why some people prefer to avoid it. In most products, the levels are very low and regulated.
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
Oleth-106 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 Oleth-106.
- 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
Oleth-106 is a synthetic emulsifier derived from oleyl alcohol (a fatty alcohol from plant or animal sources) that has been reacted with approximately 106 units of ethylene oxide. This creates a water-soluble molecule that helps stabilize oil-in-water emulsions.
How it works
Oleth-106 works by positioning itself at the boundary between oil and water droplets, reducing surface tension so the two normally unmixable phases can form a stable, uniform cream or lotion. It also helps cleanse by lowering the surface tension of water, allowing it to better wet and remove dirt and oil from skin.
Pros
Effective emulsifier
Oleth-106 reliably blends oil and water, giving creams and lotions a smooth, uniform texture that feels pleasant on the skin.
Low irritation potential
At typical use levels, Oleth-106 is considered non-irritating for most skin types, making it suitable for many everyday products.
Cons and cautions
Ethoxylate concerns
As an ethoxylated ingredient, Oleth-106 may contain trace amounts of 1,4-dioxane, a potential carcinogen, though levels are strictly regulated in finished products.
Not ideal for sensitive skin
Some people with very reactive skin may experience mild stinging or irritation, especially in high-concentration cleansers.
Best for
- People using standard creams and lotions who want a stable texture
- Those looking for effective, low-cost emulsifiers in mass-market products
Use caution if
- Individuals with very sensitive or reactive skin who prefer ethoxylate-free formulations
Usage tips
Safety summary
Oleth-106 is generally safe for use in cosmetics at typical concentrations. The main safety concern is the potential for trace 1,4-dioxane contamination, but regulatory limits keep levels very low. It is considered low-irritant and non-comedogenic for most people.
Research notes
Research on Oleth-106 specifically is limited, but the broader class of Oleth ingredients has been reviewed by the Cosmetic Ingredient Review (CIR) panel, which found them safe as used. Studies on ethoxylated surfactants indicate low acute toxicity and skin irritation at typical cosmetic levels.
Common label clues
- Typical concentration
- Typically 0.5% to 5% of the formula
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed Oleth ingredients safe as used, with limits on 1,4-dioxane impurities.
- Common uses
- Cleansers, Emulsions, Lotions, Creams
- Environmental note
- Oleth-106 is not readily biodegradable in all environments, which can contribute to aquatic persistence. However, it is not classified as bioaccumulative.
Good to know
- Oleth-106 is part of a larger family of Oleth ingredients (Oleth-2, Oleth-10, etc.) with varying ethylene oxide chain lengths.
- The '106' refers to the approximate number of ethylene oxide units, which affects its water solubility and emulsifying properties.
- Many brands now market 'ethoxylate-free' products to avoid potential 1,4-dioxane concerns.
Common questions
What is Oleth-106 in beauty products?
Oleth-106 is a man-made ingredient that helps oil and water mix together in creams and lotions. It's part of a family of ingredients called ethoxylates, which are made by adding ethylene oxide to fatty alcohols. While it's generally considered safe, the manufacturing process can sometimes leave behind tiny traces of impurities like 1,4-dioxane, which is why some people prefer to avoid it. In most products, the levels are very low and regulated.
What does Oleth-106 do in a beauty product?
Oleth-106 works by positioning itself at the boundary between oil and water droplets, reducing surface tension so the two normally unmixable phases can form a stable, uniform cream or lotion. It also helps cleanse by lowering the surface tension of water, allowing it to better wet and remove dirt and oil from skin.
Is Oleth-106 safe for most people?
Oleth-106 is generally safe for use in cosmetics at typical concentrations. The main safety concern is the potential for trace 1,4-dioxane contamination, but regulatory limits keep levels very low. It is considered low-irritant and non-comedogenic for most people.
Who should be careful with Oleth-106?
Individuals with very sensitive or reactive skin who prefer ethoxylate-free formulations
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.