Ingredient
MEK
MEK is flagged for pregnancy, breastfeeding, trying to conceive, postpartum, PCOS and general use. The concern behind the strongest flag is absorbed into the body and fetal development.
- Methyl Ethyl Ketone
- 2-Butanone
- Butanone
Verdict by profile
Truva checks every ingredient against six profiles. Jump to any of them for the full assessment.
- Strongest verdict
- Not Recommended
- Its verdict for pregnancy, the profile this one is worst in
- Profiles flagged
- 6 of 6
- Counting avoid, high risk and medium risk
- Irritancy
- 4 of 5
- Higher means more likely to sting or redden
MEK and pregnancy
Not Recommended
- Absorbed into the body
- Fetal development
- Known teratogen
MEK (methyl ethyl ketone) is a volatile organic solvent used in nail products and industrial cosmetics. Its high volatility means it's easily inhaled when products are applied, and it can be absorbed through the skin due to its small molecular size and lipophilic nature. According to ECHA and occupational health studies, MEK exposure during pregnancy raises significant concerns. Animal studies have demonstrated developmental toxicity and adverse effects on fetal development at levels achievable through occupational exposure. The solvent crosses the placental barrier and can accumulate in fetal tissues. Research on pregnant workers exposed to MEK showed associations with increased risk of developmental abnormalities and preterm birth. While cosmetic concentrations are lower than industrial exposures, ACOG and most obstetricians recommend avoiding unnecessary solvent exposure during pregnancy. The volatile nature of MEK means inhalation exposure occurs whenever the product is used, creating repeated exposure scenarios. Given safer alternatives exist for all cosmetic functions, pregnant women should avoid products containing MEK throughout all trimesters.
MEK and breastfeeding
Not Recommended
- Passes into breast milk
- Infant exposure
- Absorbed into the body
MEK is a volatile solvent that is readily absorbed through skin contact and inhalation during product use. Due to its lipophilic (fat-soluble) properties, it can accumulate in fatty tissues including breast tissue and may transfer into breast milk. While specific studies on MEK in breast milk are limited, occupational medicine research shows that volatile organic solvents can be detected in the milk of exposed workers. The solvent's small molecular size and fat solubility create a mechanism for milk transfer. Additionally, inhalation exposure during use could lead to infant exposure through vapor in the air during breastfeeding or close contact. Toxicologists and pediatricians generally recommend breastfeeding mothers avoid products containing industrial solvents like MEK. The potential for both direct milk transfer and vapor exposure to the infant, combined with MEK's known irritant and neurotoxic effects, make it advisable to choose solvent-free alternatives during the breastfeeding period.
MEK and postpartum
Caution Advised
- Irritant
- Absorbed into the body
For women not breastfeeding, MEK still presents concerns related to its irritant properties and volatile nature. The solvent can cause respiratory irritation, headaches, and dizziness through inhalation exposure during product use, effects that may be particularly unwelcome during postpartum recovery. While reproductive concerns are less relevant when not pregnant or breastfeeding, MEK's general health effects remain. Postpartum women may have heightened sensitivity to chemical odors and irritants. Given that safer, less irritating alternatives exist for all cosmetic applications where MEK is used, choosing MEK-free products is advisable during postpartum recovery.
MEK and trying to conceive
Not Recommended
- Fertility effects
- Builds up in tissue
Women trying to conceive should avoid MEK due to its documented reproductive toxicity in animal studies. Research has shown that ketone exposure can affect ovarian function and oocyte quality in laboratory settings. The solvent's lipophilic nature means it can accumulate in fatty tissues over time with repeated exposure. Reproductive toxicologists recommend minimizing exposure to industrial solvents during the preconception period. Since it's impossible to predict exactly when conception will occur, avoiding MEK-containing products while trying to conceive is prudent. The solvent should be discontinued at least several weeks before actively trying to conceive to allow body clearance, as it can persist in fatty tissues.
MEK and PCOS
Caution Advised
- Irritant
- Endocrine disruptor
MEK is a volatile organic solvent with potential endocrine-disrupting properties based on animal studies. While not a primary hormone disruptor like phthalates or parabens, some research suggests that chronic ketone exposure may affect metabolic and hormonal pathways. For women with PCOS who already experience hormonal imbalance and often have insulin resistance, exposure to compounds with potential metabolic effects is worth considering. MEK's irritant properties may also exacerbate skin sensitivity common in PCOS-related acne treatments. While occasional cosmetic use is unlikely to significantly impact PCOS symptoms, women with this condition may prefer to avoid MEK-containing products, particularly nail products used frequently. Gentler, non-volatile alternatives provide the same cosmetic benefits without irritation or potential endocrine concerns.
MEK and general use
Caution Advised
- Irritant
- Absorbed into the body
MEK (methyl ethyl ketone) is a volatile organic solvent primarily found in nail polish removers and some industrial cosmetics. It effectively dissolves nail polish and acts as a perfuming agent, but its high volatility and small molecular size mean significant exposure occurs through both skin absorption and inhalation during use. According to ECHA and OSHA, MEK is classified as an irritant to skin, eyes, and respiratory tract. Short-term exposure can cause headaches, dizziness, and nausea due to its effects on the central nervous system. Long-term occupational exposure has been associated with peripheral neuropathy and potential liver effects. The EPA classifies it as a hazardous air pollutant. While cosmetic concentrations are typically lower than industrial exposures, the ingredient's irritant potential and volatile nature have led many cosmetic manufacturers to reformulate with gentler alternatives. For general consumers, occasional use in nail products is likely low risk, but frequent exposure or use in poorly ventilated areas should be avoided. Individuals with respiratory conditions, chemical sensitivities, or frequent headaches may want to choose MEK-free alternatives.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of MEK, each one with its own page here.
Ingredients that raise the same concerns.
Where this came from
Truva summarises published guidance from bodies including ACOG, the FDA, the EU SCCS and the Cosmetic Ingredient Review. It has no access to your medical history and it is not a substitute for your doctor, dermatologist or midwife. These assessments have not been reviewed by a clinician, and nothing here is a diagnosis or a prescription. If you are pregnant, breastfeeding or being treated for PCOS, take the ingredient list to the person looking after you.
Assessment last pulled from the ingredient database on .
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A label has thirty of them. Truva reads the whole list at once and answers for the profile you set: pregnancy, breastfeeding, postpartum, trying to conceive, PCOS, or general use.
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