Ingredient review
Ethyl Methylbutyl Ketoxime
INCI: ETHYL METHYLBUTYL KETOXIME
A synthetic fragrance ingredient with limited safety data; best avoided by those with sensitive skin or fragrance allergies.
In plain English
Ethyl Methylbutyl Ketoxime is a man-made chemical added to some cosmetics to provide a scent or help stabilize other ingredients. It belongs to a class of compounds called oximes, which are not naturally found in the body. Because it's used in tiny amounts, it's unlikely to cause problems for most people, but there isn't a lot of research on its long-term effects on skin.
Review score
Safety, usefulness, and evidence
Useful in the right context, but not low-maintenance
The evidence base is still emerging, so marketing claims deserve extra caution.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Ethyl Methylbutyl Ketoxime can be useful, but watch for some irritation potential.
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 Ethyl Methylbutyl Ketoxime.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A synthetic organic compound from the oxime family, produced in a lab and used as a fragrance ingredient or stabilizer in cosmetic formulations.
How it works
In a cosmetic product, Ethyl Methylbutyl Ketoxime contributes to the overall fragrance profile or acts as a stabilizer to prevent other ingredients from breaking down. It does not provide any active skincare benefit like moisturizing or exfoliating.
Pros
Enhances sensory experience
Provides a pleasant scent that can make skincare routines more enjoyable for those who like fragranced products.
Low comedogenic risk
Unlikely to clog pores, making it suitable for acne-prone skin in terms of breakouts, though irritation is still possible.
Cons and cautions
Limited safety research
There is very little published research on the long-term skin effects of Ethyl Methylbutyl Ketoxime, so its safety profile is not well-established.
Potential irritant
As a synthetic fragrance ingredient, it may cause irritation, redness, or allergic reactions in people with sensitive skin or fragrance sensitivities.
Best for
- Those who tolerate synthetic fragrances well
- Users of fragranced products without sensitivity
Use caution if
- People with sensitive or reactive skin
- Those with known fragrance allergies
Usage tips
Safety summary
Ethyl Methylbutyl Ketoxime is considered safe at the very low levels used in cosmetics, but the lack of comprehensive safety data means caution is warranted, especially for those with sensitive or allergy-prone skin.
Research notes
There is very little peer-reviewed research on this specific ingredient. Most safety assessments rely on general oxime toxicity data rather than direct cosmetic-use studies.
Common label clues
- Typical concentration
- Typically used at very low concentrations (under 1%)
- Regulatory status
- Approved for use in cosmetics in the EU and US at low concentrations, but not specifically reviewed by the Cosmetic Ingredient Review (CIR) panel as of 2025.
- Common uses
- Fragranced products, Stabilizing formulations
- Environmental note
- As a synthetic compound, its environmental persistence and biodegradability are not well-documented. Minimal data is available on its ecological impact.
Good to know
- This ingredient is not a common active in skincare; it's primarily a fragrance component.
- Fragrance ingredients are often listed generically as 'fragrance' or 'parfum' on labels, so you may not see this specific name on every product that contains it.
Common questions
What is Ethyl Methylbutyl Ketoxime in beauty products?
Ethyl Methylbutyl Ketoxime is a man-made chemical added to some cosmetics to provide a scent or help stabilize other ingredients. It belongs to a class of compounds called oximes, which are not naturally found in the body. Because it's used in tiny amounts, it's unlikely to cause problems for most people, but there isn't a lot of research on its long-term effects on skin.
What does Ethyl Methylbutyl Ketoxime do in a beauty product?
In a cosmetic product, Ethyl Methylbutyl Ketoxime contributes to the overall fragrance profile or acts as a stabilizer to prevent other ingredients from breaking down. It does not provide any active skincare benefit like moisturizing or exfoliating.
Is Ethyl Methylbutyl Ketoxime safe for most people?
Ethyl Methylbutyl Ketoxime is considered safe at the very low levels used in cosmetics, but the lack of comprehensive safety data means caution is warranted, especially for those with sensitive or allergy-prone skin.
Who should be careful with Ethyl Methylbutyl Ketoxime?
People with sensitive or reactive skin Those with known fragrance allergies
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.