Ingredient review
Capryleth-5
INCI: Capryleth-5
A gentle, well-tolerated emulsifier that helps mix oil and water in cleansers and lotions without stripping the skin.
In plain English
Capryleth-5 is a mild cleansing and mixing ingredient made from caprylic acid (a fatty acid found in coconut oil) and ethylene oxide. It helps oil and water blend together in products like face washes and lotions, so they feel smooth and rinse off easily. Because it's very gentle, it's often used in products for sensitive 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.
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
Capryleth-5 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 Capryleth-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
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
Capryleth-5 is a semi-synthetic non-ionic surfactant and emulsifier. It belongs to the alkyl ethoxylate family, made by reacting caprylic alcohol (from coconut or palm kernel oil) with about 5 units of ethylene oxide. This gives it both water-loving and oil-loving properties.
How it works
In a cosmetic product, Capryleth-5 sits at the boundary between oil and water droplets, lowering surface tension so they mix into a stable emulsion. In cleansers, it helps lift dirt and oil from the skin so they can be rinsed away without leaving a greasy residue. Its mildness comes from its non-ionic nature, meaning it doesn't carry a charge that could irritate the skin.
Pros
Very gentle on skin
Capryleth-5 is a non-ionic surfactant, meaning it doesn't strip the skin's natural oils as harshly as sulfates, making it ideal for sensitive or dry skin types.
Effective emulsifier
It helps oil and water blend smoothly in creams and lotions, giving them a stable, pleasant texture without separating.
Cons and cautions
Ethoxylation concerns
Like all ethoxylated ingredients, Capryleth-5 may contain trace amounts of 1,4-dioxane, a potential contaminant. Reputable manufacturers purify it to safe levels, but it's something to be aware of.
Not fully natural
Although derived from plant-based caprylic acid, the ethoxylation process is synthetic, so it won't appeal to those seeking 100% natural or 'free-from' formulas.
Best for
- People with normal to sensitive skin looking for a gentle cleanser
- Those who prefer mild, non-stripping surfactants in their daily routine
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
- Those seeking 100% natural or fully biodegradable formulas
Usage tips
Safety summary
Capryleth-5 is considered safe for use in cosmetics at typical concentrations. The main concern is trace 1,4-dioxane from ethoxylation, but reputable manufacturers purify the ingredient to meet safety limits. It has a low irritation and comedogenic risk.
Research notes
Research on Capryleth-5 specifically is limited, but the broader family of alkyl ethoxylates has been reviewed by the Cosmetic Ingredient Review (CIR) panel, which concluded they are safe in cosmetic formulations. Studies show non-ionic surfactants like Capryleth-5 are less irritating than anionic surfactants (e.g., sodium lauryl sulfate).
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA (as part of generally recognized safe ingredients) and the EU Cosmetics Regulation. The Cosmetic Ingredient Review (CIR) panel has reviewed alkyl ethoxylates and found them safe as used.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Capryleth-5 is not readily biodegradable in all environments, but it is less persistent than some other ethoxylates. Its plant-derived caprylic acid portion is renewable.
Good to know
- Capryleth-5 is often used alongside other mild surfactants to boost foam without increasing irritation.
- It is considered safe by major regulatory bodies when used in typical cosmetic concentrations.
Common questions
What is Capryleth-5 in beauty products?
Capryleth-5 is a mild cleansing and mixing ingredient made from caprylic acid (a fatty acid found in coconut oil) and ethylene oxide. It helps oil and water blend together in products like face washes and lotions, so they feel smooth and rinse off easily. Because it's very gentle, it's often used in products for sensitive skin.
What does Capryleth-5 do in a beauty product?
In a cosmetic product, Capryleth-5 sits at the boundary between oil and water droplets, lowering surface tension so they mix into a stable emulsion. In cleansers, it helps lift dirt and oil from the skin so they can be rinsed away without leaving a greasy residue. Its mildness comes from its non-ionic nature, meaning it doesn't carry a charge that could irritate the skin.
Is Capryleth-5 safe for most people?
Capryleth-5 is considered safe for use in cosmetics at typical concentrations. The main concern is trace 1,4-dioxane from ethoxylation, but reputable manufacturers purify the ingredient to meet safety limits. It has a low irritation and comedogenic risk.
Who should be careful with Capryleth-5?
Individuals with known allergies to ethoxylated ingredients (rare) Those seeking 100% natural or fully biodegradable formulas
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.