Ingredient

Styrene

Styrene is flagged for pregnancy, breastfeeding, trying to conceive, postpartum, PCOS and general use. The concern behind the strongest flag is carcinogen concern and endocrine disruptor.

By Team TruvaLast checked

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
PregnancyAVOID

Styrene and pregnancy

Not Recommended

Styrene is a volatile organic compound used as a fragrance ingredient in cosmetics. It's a petrochemical that readily evaporates and can be absorbed through skin and inhalation. The compound is classified by IARC as possibly carcinogenic to humans. According to the ECHA, styrene is a suspected endocrine disruptor and potential reproductive toxicant. Studies have shown that occupational exposure to styrene during pregnancy is associated with increased risks of spontaneous abortion and developmental effects. While cosmetic concentrations are lower than occupational exposures, the compound's ability to cross biological membranes and its volatility raise serious concerns. The National Toxicology Program notes that styrene can cross the placenta, and animal studies have demonstrated reproductive and developmental toxicity. ACOG recommends that pregnant women avoid unnecessary chemical exposures, particularly those classified as potential carcinogens or endocrine disruptors. The EU has restricted styrene in cosmetics, and most medical professionals advise pregnant women to avoid products containing this ingredient. Given its classification as a possible carcinogen and endocrine disruptor, along with evidence of placental transfer, styrene should be avoided throughout pregnancy.

BreastfeedingAVOID

Styrene and breastfeeding

Not Recommended

Styrene is a volatile petrochemical compound used for fragrance. Its chemical structure allows it to be absorbed through skin and inhaled, with the potential to enter the bloodstream and subsequently breast milk. Studies have detected styrene and its metabolites in breast milk following maternal exposure. The compound's lipophilic (fat-loving) nature means it can accumulate in breast milk, which has high fat content. Given styrene's classification by IARC as possibly carcinogenic and its recognition as a potential endocrine disruptor by ECHA, exposure of breastfed infants raises significant concerns. Infants have immature detoxification systems and are more vulnerable to chemical exposures than adults. The AAD and lactation consultants recommend avoiding cosmetic ingredients that are potential carcinogens or endocrine disruptors during breastfeeding. Because styrene can transfer to breast milk and pose unnecessary risks to the developing infant, breastfeeding mothers should avoid products containing this ingredient. Safer fragrance alternatives are readily available.

PostpartumAVOID

Styrene and postpartum

Not Recommended

Styrene is a petrochemical fragrance ingredient classified as possibly carcinogenic to humans by IARC. Even without breastfeeding concerns, the ingredient's potential carcinogenicity and endocrine-disrupting properties make it inadvisable for regular use. For postpartum women not breastfeeding, the primary concerns are long-term health effects from repeated exposure. While avoiding breast milk transfer isn't a factor, the compound's classification as a suspected carcinogen and hormone disruptor means that minimizing exposure is prudent for overall health. Many safer fragrance alternatives exist.

Trying to ConceiveAVOID

Styrene and trying to conceive

Not Recommended

Styrene is classified as a potential endocrine disruptor and possible carcinogen by international health agencies. For women trying to conceive, exposure to endocrine-disrupting chemicals can interfere with reproductive hormones critical for ovulation and conception. Studies on occupational styrene exposure have shown associations with menstrual irregularities and reduced fertility. While cosmetic exposures are lower, the compound's ability to disrupt hormonal systems during the critical preconception period makes it advisable to avoid. Women preparing for pregnancy should minimize exposure to substances that could affect hormonal balance or accumulate in the body before conception.

PCOSAVOID

Styrene and PCOS

Not Recommended

Styrene is a petrochemical fragrance ingredient recognized by ECHA as a suspected endocrine disruptor. For women with PCOS, who already struggle with hormonal imbalances involving androgens, insulin, and other hormones, exposure to endocrine-disrupting chemicals is particularly concerning. While specific studies on styrene and PCOS are limited, the compound's ability to interfere with hormonal systems could theoretically worsen hormonal dysregulation. Women with PCOS often work hard to manage their hormone levels through medication, diet, and lifestyle changes, making it counterproductive to use products containing known endocrine disruptors. Endocrinologists and dermatologists treating PCOS patients typically recommend minimizing exposure to endocrine-disrupting chemicals when possible. Given styrene's classification and the availability of safer alternatives, women with PCOS should choose fragrance-free or naturally fragranced products instead.

General UseAVOID

Styrene and general use

Not Recommended

Styrene is a petrochemical compound used as a fragrance ingredient in some cosmetic products. It's a volatile organic compound with a characteristic sweet odor that can be absorbed through skin and by inhalation. The International Agency for Research on Cancer (IARC) classifies styrene as possibly carcinogenic to humans (Group 2B). The ECHA identifies it as a suspected carcinogen, skin irritant, and potential endocrine disruptor. Long-term exposure studies have raised concerns about its effects on the nervous system and potential reproductive toxicity. The compound can cause eye and skin irritation on contact. Due to these health concerns, the EU regulates styrene under REACH, and many cosmetic manufacturers have voluntarily removed it from their formulations. For the general public, while occasional minimal exposure may not cause immediate harm, regular use of products containing styrene is not advisable given safer alternatives exist. Those with sensitive skin or respiratory issues should particularly avoid this ingredient.

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Provenance

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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