Ingredient review
Coceth-5
INCI: COCETH-5
A gentle, coconut-derived cleansing agent that helps products foam and rinse clean without stripping the skin.
In plain English
Coceth-5 is a mild surfactant made from coconut fatty alcohol and ethylene oxide. It helps cleansers and shampoos create a gentle foam and effectively remove dirt and oil. Because it is non-ionic (no electric charge), it is less likely to irritate sensitive skin compared to harsher sulfates. It also works as an emulsifier, helping water and oil blend together in creams and lotions.
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
Coceth-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 Coceth-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
Coceth-5 is a semi-synthetic surfactant and emulsifier produced by reacting coconut-derived fatty alcohol with 5 units of ethylene oxide. It belongs to the alkyl ethoxylate family and is known for its mildness and compatibility with other ingredients.
How it works
In a cosmetic product, Coceth-5 reduces the surface tension between water and oil, allowing them to mix and form a stable emulsion. In cleansers, it helps lift dirt and sebum from the skin so they can be rinsed away. Its non-ionic nature means it does not carry a charge, which makes it gentle on the skin barrier and less likely to cause irritation.
Pros
Mild on skin
Coceth-5 is a non-ionic surfactant, meaning it is less likely to strip the skin's natural oils or cause irritation compared to anionic surfactants like sodium lauryl sulfate.
Good emulsifier
It helps blend oil and water phases in creams and lotions, improving product texture and stability without needing high concentrations.
Cons and cautions
Ethoxylation concerns
The manufacturing process involves ethoxylation, which can leave trace amounts of 1,4-dioxane, a potential carcinogen. Reputable manufacturers purify to remove this contaminant.
Not fully natural
Although derived from coconut, the ethoxylation step makes it semi-synthetic, which may not appeal to those seeking entirely natural or green formulations.
Best for
- People with normal to dry skin looking for a mild cleanser
- Those who prefer sulfate-free or gentle cleansing formulas
Use caution if
- Individuals with known sensitivity to ethoxylated ingredients
- Those seeking 100% natural or fully biodegradable products
Usage tips
Safety summary
Coceth-5 is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential presence of 1,4-dioxane, which is regulated and minimized through purification. Overall, it is a low-irritant, low-comedogenic ingredient suitable for most skin types.
Research notes
Research on Coceth-5 specifically is limited, but the broader class of alkyl ethoxylates has been reviewed by the Cosmetic Ingredient Review (CIR) panel and found safe for use in rinse-off and leave-on products when formulated properly. Studies confirm low skin irritation and sensitization potential.
Common label clues
- Typical concentration
- 0.5–5% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. Manufacturers are expected to follow good manufacturing practices to minimize 1,4-dioxane residues.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Coceth-5 is derived from renewable coconut sources, but the ethoxylation process and potential for 1,4-dioxane formation raise environmental concerns. It is not readily biodegradable in all aquatic environments.
Good to know
- Coceth-5 is often used in 'sulfate-free' shampoos and body washes.
- The number '5' refers to the average moles of ethylene oxide added per molecule.
Common questions
What is Coceth-5 in beauty products?
Coceth-5 is a mild surfactant made from coconut fatty alcohol and ethylene oxide. It helps cleansers and shampoos create a gentle foam and effectively remove dirt and oil. Because it is non-ionic (no electric charge), it is less likely to irritate sensitive skin compared to harsher sulfates. It also works as an emulsifier, helping water and oil blend together in creams and lotions.
What does Coceth-5 do in a beauty product?
In a cosmetic product, Coceth-5 reduces the surface tension between water and oil, allowing them to mix and form a stable emulsion. In cleansers, it helps lift dirt and sebum from the skin so they can be rinsed away. Its non-ionic nature means it does not carry a charge, which makes it gentle on the skin barrier and less likely to cause irritation.
Is Coceth-5 safe for most people?
Coceth-5 is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential presence of 1,4-dioxane, which is regulated and minimized through purification. Overall, it is a low-irritant, low-comedogenic ingredient suitable for most skin types.
Who should be careful with Coceth-5?
Individuals with known sensitivity to ethoxylated ingredients Those seeking 100% natural or fully biodegradable 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.