Ingredient
DMDM Hydantoin
DMDM Hydantoin is flagged for pregnancy, postpartum, trying to conceive and general use. The concern behind the strongest flag is common allergen and absorbed into the body.
- 1,3-Dimethylol-5,5-dimethylhydantoin
- Glydant
Verdict by profile
Truva checks every ingredient against six profiles. Jump to any of them for the full assessment.
- Strongest verdict
- Caution Advised
- Its verdict for pregnancy, the profile this one is worst in
- Profiles flagged
- 4 of 6
- Counting avoid, high risk and medium risk
- Irritancy
- 3 of 5
- Higher means more likely to sting or redden
DMDM Hydantoin and pregnancy
Caution Advised
- Common allergen
- Absorbed into the body
DMDM hydantoin is a formaldehyde-releasing preservative that slowly releases small amounts of formaldehyde to prevent bacterial growth in cosmetic products. While formaldehyde exposure via inhalation is a known concern during pregnancy, topical exposure through cosmetics presents lower risk. However, formaldehyde can be absorbed through skin, and pregnancy increases skin sensitivity. According to OSHA, occupational formaldehyde exposure during pregnancy has been associated with spontaneous abortion and developmental effects, though these studies involved inhalation at higher concentrations. The limited data on topical cosmetic use creates uncertainty. ACOG does not explicitly address DMDM hydantoin, but many obstetricians recommend avoiding formaldehyde-releasing preservatives as a precautionary measure due to formaldehyde's classification as a potential carcinogen. Given the availability of alternative preservatives and increased skin sensitivity during pregnancy, many women choose formaldehyde-free products.
DMDM Hydantoin and breastfeeding
Safe to Use
- Common allergen
- Irritant
DMDM hydantoin is a preservative that releases formaldehyde in small amounts to prevent microbial contamination in cosmetic products. The primary concern during breastfeeding is not milk transfer but rather skin irritation and allergic reactions, which may be more pronounced due to postpartum hormonal changes. Formaldehyde from topical sources has minimal systemic absorption and is unlikely to pass into breast milk in significant amounts. However, if applied near the breast area, infant skin contact could occur. The AAD does not specifically restrict DMDM hydantoin during breastfeeding, though many dermatologists recommend avoiding application on or near the chest due to potential infant contact. Using it on other body areas is generally considered acceptable, though alternatives may be preferable for sensitive skin.
DMDM Hydantoin and postpartum
Caution Advised
- Common allergen
- Irritant
DMDM hydantoin functions as a preservative by slowly releasing formaldehyde. Postpartum hormonal fluctuations can increase skin sensitivity and reactivity to allergens. The ingredient's classification as Contact Allergen of the Year 2021 by the American Contact Dermatitis Society reflects its high potential for causing allergic contact dermatitis. Postpartum women may be more susceptible to developing sensitivities. If you haven't used products with DMDM hydantoin before, postpartum may not be the ideal time to start due to heightened skin reactivity.
DMDM Hydantoin and trying to conceive
Caution Advised
- Common allergen
- Absorbed into the body
DMDM hydantoin releases small amounts of formaldehyde, which has raised concerns about reproductive health based on occupational exposure studies. However, these studies primarily involve inhalation, not topical cosmetic use. While there's no direct evidence that topical DMDM hydantoin affects fertility, many women trying to conceive prefer to minimize formaldehyde exposure as a precautionary approach. The ingredient doesn't accumulate in the body, but given the many alternative preservatives available, switching to formaldehyde-free products is a conservative choice when preparing for pregnancy.
DMDM Hydantoin and PCOS
Safe to Use
- Common allergen
- Irritant
- Can inflame skin
DMDM hydantoin is a preservative with no hormonal activity or effects on androgen levels, insulin sensitivity, or other PCOS-related pathways. The main concern for PCOS is that it can cause skin irritation and allergic reactions, potentially worsening inflammatory skin conditions. Since PCOS often involves inflammatory acne, irritating ingredients may exacerbate breakouts through increased inflammation rather than hormonal mechanisms. From a PCOS management perspective, DMDM hydantoin doesn't interfere with treatment or hormone balance. However, individuals with sensitive or inflamed acne-prone skin may benefit from choosing preservatives with lower irritation potential.
DMDM Hydantoin and general use
Caution Advised
- Common allergen
- Irritant
DMDM hydantoin is an antimicrobial preservative that works by releasing small amounts of formaldehyde over time, preventing bacterial and fungal contamination in water-based cosmetic products. The American Contact Dermatitis Society named DMDM hydantoin Contact Allergen of the Year in 2021 due to its high rate of causing allergic contact dermatitis. Formaldehyde, which it releases, is a known sensitizer and irritant. According to the CIR Expert Panel, it's safe at concentrations up to 0.6%, but sensitive individuals may react even at lower levels. The EU restricts DMDM hydantoin to 0.6% (as formaldehyde equivalent), and it's banned in Japan. While not prohibited by the FDA, many brands are reformulating to remove formaldehyde-releasing preservatives due to allergenicity concerns. People with sensitive skin or formaldehyde allergies should avoid this ingredient.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of DMDM Hydantoin, 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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