Ingredient
Formaldehyde
Formaldehyde is flagged for pregnancy, breastfeeding, postpartum, trying to conceive, PCOS and general use. The concern behind the strongest flag is known teratogen and absorbed into the body.
- Formalin
- Methanal
- Methylene Oxide
- Formic Aldehyde
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
- 5 of 5
- Higher means more likely to sting or redden
Formaldehyde and pregnancy
Not Recommended
- Known teratogen
- Absorbed into the body
- Fetal development
Formaldehyde is a preservative that prevents bacterial contamination in cosmetic products. It is also released by formaldehyde-donor preservatives commonly found in nail products and hair treatments. According to ACOG and the EPA, formaldehyde exposure during pregnancy is associated with increased risk of miscarriage and adverse fetal outcomes. Studies have linked occupational formaldehride exposure to developmental toxicity. The compound is highly volatile and can be absorbed through skin contact and inhalation, raising concerns about systemic exposure during pregnancy. The FDA and ECHA both recognize formaldehyde as a category 1B carcinogen and reproductive toxicant. ACOG recommends pregnant women avoid all formaldehyde-containing products, including nail polish, hair straightening treatments, and cosmetics listing formaldehyde or formaldehyde-releasing preservatives. The EU Cosmetics Regulation requires products with formaldehyde to carry pregnancy warnings.
Formaldehyde and breastfeeding
Not Recommended
- Absorbed into the body
- Infant exposure
Formaldehyde is a volatile compound that can be absorbed through the skin and inhaled from cosmetic products. It is classified as a known carcinogen by the International Agency for Research on Cancer (IARC). While specific data on formaldehyde transfer into breast milk is limited, the compound's high reactivity and potential for systemic absorption raise concerns about infant exposure through close contact during breastfeeding. The AAD and most dermatologists recommend avoiding formaldehyde-containing products during breastfeeding due to the volatile nature of the compound and potential respiratory exposure to infants. Healthcare providers universally recommend that breastfeeding mothers avoid formaldehyde in cosmetics, particularly in nail products and hair treatments where exposure levels can be significant. Safer preservative alternatives are widely available and preferred during this period.
Formaldehyde and postpartum
Not Recommended
- Carcinogen concern
- Common allergen
- Irritant
Formaldehyde remains a known carcinogen and potent allergen regardless of pregnancy or breastfeeding status. The FDA and IARC classify it as a human carcinogen based on extensive research linking exposure to cancer risk. Postpartum women should continue to avoid formaldehyde due to its established health risks, including respiratory irritation, skin sensitization, and long-term carcinogenic potential. The compound offers no skin benefits that cannot be achieved with safer preservative alternatives.
Formaldehyde and trying to conceive
Not Recommended
- Fertility effects
- Hormone disruptor
Formaldehyde is a known reproductive toxicant according to the EPA and ECHA. Research has linked formaldehyde exposure to reduced fertility in both women and men, with occupational studies showing associations with menstrual irregularities and longer time to conception. Healthcare providers recommend women discontinue formaldehyde-containing products before attempting conception. The compound's potential effects on reproductive hormones and egg quality make it particularly concerning during the preconception period. Most fertility specialists advise a 3-month washout period before trying to conceive.
Formaldehyde and PCOS
Not Recommended
- Hormone disruptor
- Can inflame skin
Formaldehyde is a preservative and known carcinogen found in some cosmetic products. Beyond its cancer risk, emerging research suggests formaldehyde may have endocrine-disrupting properties. Studies indicate formaldehyde exposure may affect hormone signaling pathways and increase inflammatory markers. For women with PCOS who often experience hormonal imbalances and chronic inflammation, avoiding formaldehyde is particularly advisable. The ECHA and FDA both recommend minimizing formaldehyde exposure regardless of hormonal conditions. Women with PCOS should choose formaldehyde-free cosmetics, especially given the availability of numerous safer preservative options.
Formaldehyde and general use
Not Recommended
- Carcinogen concern
- Common allergen
- Irritant
Formaldehyde is a preservative used in some cosmetics to prevent microbial contamination. It is also released by formaldehyde-donor preservatives like DMDM hydantoin, diazolidinyl urea, and quaternium-15. The FDA, EPA, and IARC classify formaldehyde as a known human carcinogen. Long-term exposure is linked to nasopharyngeal cancer and leukemia. Formaldehyde is also a potent skin sensitizer that can cause allergic contact dermatitis, respiratory irritation, and asthma symptoms. Even low-level exposure can trigger reactions in sensitized individuals. The EU restricts formaldehyde to 0.2% in cosmetics and bans it entirely in aerosol products. The FDA requires formaldehyde disclosure on ingredient labels when present above 0.05% in leave-on products. Most dermatologists recommend avoiding formaldehyde-containing cosmetics entirely, as safer preservative alternatives are readily available.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of Formaldehyde, 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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