Ingredient review
Mercaptoisopropyl-5-Methylcyclohexanone
INCI: MERCAPTOISOPROPYL-5-METHYLCYCLOHEXANONE
A synthetic fragrance ingredient with limited safety data; best for those who tolerate fragrance well.
In plain English
This is a man-made chemical used to add a specific smell to skincare and beauty products. It belongs to a group of ingredients called mercaptans, which are known for their strong odors. Because it is a fragrance ingredient, it doesn't provide any skin benefit like moisturizing or anti-aging—it's purely for scent. People with sensitive skin or fragrance allergies may want to avoid it.
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
Mercaptoisopropyl-5-Methylcyclohexanone 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 Mercaptoisopropyl-5-Methylcyclohexanone.
- 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 mercaptan family, used as a fragrance ingredient in cosmetics.
How it works
It evaporates from the skin's surface, releasing molecules that interact with olfactory receptors in the nose to create a perception of scent. It does not actively interact with skin cells or provide any functional skincare benefit.
Pros
Enhances product appeal
Adds a pleasant scent that can make the application experience more enjoyable.
Low comedogenic risk
Unlikely to clog pores, making it suitable for acne-prone skin if tolerated.
Cons and cautions
Potential irritant
Can cause redness, itching, or stinging in people with sensitive skin or fragrance allergies.
Limited safety research
There is little publicly available data on long-term skin exposure, so its safety profile is not fully established.
Best for
- People who enjoy scented products and have no history of fragrance allergies
- Those looking for a specific scent note in their routine
Use caution if
- Individuals with sensitive skin or known fragrance allergies
- Anyone following a fragrance-free skincare routine
Usage tips
Safety summary
Considered safe for most people at low concentrations used in cosmetics, but may cause irritation or allergic reactions in sensitive individuals. Limited independent safety data is available.
Research notes
There is minimal peer-reviewed research specifically on this compound in cosmetic use. Safety assessments rely on general fragrance ingredient guidelines.
Common label clues
- Typical concentration
- Very low, typically less than 1%
- Regulatory status
- Approved for use in cosmetics in the EU and US, but subject to general fragrance safety regulations. No specific restrictions found for this compound.
- Common uses
- Fragranced products, Perfumes, Body lotions
- Environmental note
- As a synthetic compound, its environmental persistence and biodegradability are not well documented. General fragrance ingredients can contribute to water pollution.
Good to know
- This ingredient is not a preservative, humectant, or active skincare ingredient—it is purely for scent.
- Fragrance ingredients are often listed simply as 'fragrance' or 'parfum' on labels, so this specific name may not always appear.
Common questions
What is Mercaptoisopropyl-5-Methylcyclohexanone in beauty products?
This is a man-made chemical used to add a specific smell to skincare and beauty products. It belongs to a group of ingredients called mercaptans, which are known for their strong odors. Because it is a fragrance ingredient, it doesn't provide any skin benefit like moisturizing or anti-aging—it's purely for scent. People with sensitive skin or fragrance allergies may want to avoid it.
What does Mercaptoisopropyl-5-Methylcyclohexanone do in a beauty product?
It evaporates from the skin's surface, releasing molecules that interact with olfactory receptors in the nose to create a perception of scent. It does not actively interact with skin cells or provide any functional skincare benefit.
Is Mercaptoisopropyl-5-Methylcyclohexanone safe for most people?
Considered safe for most people at low concentrations used in cosmetics, but may cause irritation or allergic reactions in sensitive individuals. Limited independent safety data is available.
Who should be careful with Mercaptoisopropyl-5-Methylcyclohexanone?
Individuals with sensitive skin or known fragrance allergies Anyone following a fragrance-free skincare routine
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.