Ingredient review
Choleth-15
INCI: CHOLETH-15
Choleth-15 is a gentle emulsifier that helps blend water and oil in skincare, but it's rarely used alone and is best understood as a formulation helper.
In plain English
Choleth-15 is a man-made ingredient that helps water and oil mix together in your skincare products. It's made from cholesterol, a natural fat found in your skin, but processed in a lab to become a stable emulsifier. Think of it as a peacekeeper that keeps the watery and oily parts of a cream or lotion from separating. It also gives products a smooth, creamy texture. Because it's derived from a skin-friendly substance, it's generally very gentle 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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Choleth-15 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 Choleth-15.
- 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
Choleth-15 is a polyethylene glycol (PEG) ether of cholesterol. It belongs to a class of ingredients called ethoxylated alcohols, where cholesterol is reacted with 15 units of ethylene oxide. This process makes the cholesterol water-soluble while retaining its oil-loving properties, creating an effective emulsifier.
How it works
In a cosmetic product, Choleth-15 sits at the boundary between water and oil droplets. Its cholesterol-like tail embeds in oil, while its PEG chain extends into water. This reduces surface tension, allowing the two phases to blend into a stable, uniform emulsion. It also increases the thickness of the product, giving it a richer feel.
Pros
Gentle emulsifier
Choleth-15 is derived from cholesterol, a natural skin lipid, making it very mild and unlikely to cause irritation or sensitization for most skin types.
Improves product feel
It helps create a smooth, creamy texture that spreads easily and feels luxurious on the skin, enhancing the user experience of moisturizers and serums.
Cons and cautions
Manufacturing concerns
Choleth-15 is produced using ethylene oxide, which can leave trace impurities like 1,4-dioxane. However, reputable manufacturers purify the ingredient to safe levels.
Not a skin active
Unlike pure cholesterol, Choleth-15 is primarily a formulation aid. It doesn't directly moisturize or repair the skin barrier on its own.
Best for
- Anyone using standard moisturizers or cleansers
- People with normal to dry skin looking for stable, gentle formulas
Use caution if
- Those who prefer to avoid PEG-derived ingredients due to personal preference or ethical concerns
Usage tips
Safety summary
Choleth-15 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The main safety consideration is the potential for trace impurities from its manufacturing process, but these are controlled by quality standards. Overall, it is a well-tolerated formulation ingredient.
Research notes
Research on Choleth-15 is limited, but it is a well-established ingredient in cosmetic chemistry. Its safety is supported by industry reviews and regulatory approvals. Most evidence comes from formulation science rather than clinical skin studies.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and many other regions. It is not restricted but is subject to purity standards regarding 1,4-dioxane.
- Common uses
- Moisturizers, Cleansers, Hair conditioners, Serums
- Environmental note
- As a PEG derivative, Choleth-15 may be biodegradable, but its production involves fossil fuel-derived ethylene oxide. Some consumers prefer plant-based alternatives for environmental reasons.
Good to know
- Choleth-15 is often used in combination with other emulsifiers for optimal stability.
- It is considered safe by major regulatory bodies when used within standard concentrations.
- The '15' refers to the number of ethylene oxide units, which affects its water solubility.
Common questions
What is Choleth-15 in beauty products?
Choleth-15 is a man-made ingredient that helps water and oil mix together in your skincare products. It's made from cholesterol, a natural fat found in your skin, but processed in a lab to become a stable emulsifier. Think of it as a peacekeeper that keeps the watery and oily parts of a cream or lotion from separating. It also gives products a smooth, creamy texture. Because it's derived from a skin-friendly substance, it's generally very gentle and unlikely to cause irritation or clog pores.
What does Choleth-15 do in a beauty product?
In a cosmetic product, Choleth-15 sits at the boundary between water and oil droplets. Its cholesterol-like tail embeds in oil, while its PEG chain extends into water. This reduces surface tension, allowing the two phases to blend into a stable, uniform emulsion. It also increases the thickness of the product, giving it a richer feel.
Is Choleth-15 safe for most people?
Choleth-15 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The main safety consideration is the potential for trace impurities from its manufacturing process, but these are controlled by quality standards. Overall, it is a well-tolerated formulation ingredient.
Who should be careful with Choleth-15?
Those who prefer to avoid PEG-derived ingredients due to personal preference or ethical concerns
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.