Ingredient
Methylene Glycol
Methylene Glycol is flagged for pregnancy and trying to conceive. The concern behind the strongest flag is absorbed into the body and fetal development.
- Formaldehyde Hydrate
- Methanediol
- Methylene Dihydroxide
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
- 2 of 6
- Counting avoid, high risk and medium risk
- Irritancy
- 2 of 5
- Higher means more likely to sting or redden
Methylene Glycol and pregnancy
Caution Advised
- Absorbed into the body
- Fetal development
Methylene glycol is the water-based form of formaldehyde used as a preservative in cosmetics. When applied to skin, it can release small amounts of formaldehyde, which has been studied for potential reproductive effects. While occupational exposure to high levels of formaldehyde vapor has raised concerns, topical cosmetic exposure involves much lower amounts. According to the SCCS, there is limited specific data on methylene glycol during pregnancy. The concern centers on formaldehyde's classification as a potential developmental toxicant at high doses, though topical absorption from cosmetics is minimal. Some healthcare providers recommend a precautionary approach given the formaldehyde connection. The EU restricts total formaldehyde content in cosmetics to safe levels, and topical products are generally considered low exposure compared to inhalation. However, due to formaldehyde's reproductive toxicity classification and limited pregnancy-specific data, many dermatologists suggest choosing formaldehyde-free preservatives during pregnancy when alternatives are available.
Methylene Glycol and breastfeeding
Safe to Use
Methylene glycol functions as a preservative in cosmetics and can release trace amounts of formaldehyde. When used topically, systemic absorption is minimal, which reduces the likelihood of transfer to breast milk. There is no evidence that topical use of formaldehyde-releasing preservatives at cosmetic concentrations affects breast milk or breastfed infants. The small amounts used in skincare products result in negligible systemic exposure. Most dermatologists consider topical formaldehyde-releasing preservatives compatible with breastfeeding. While occupational inhalation exposure to formaldehyde is a concern for workers, topical cosmetic use represents a much lower exposure route. Standard cosmetic formulations containing methylene glycol are generally considered acceptable during breastfeeding.
Methylene Glycol and postpartum
Safe to Use
Methylene glycol serves as a preservative in cosmetics to prevent bacterial and fungal contamination. For postpartum women not breastfeeding, the primary consideration is skin sensitivity rather than systemic effects. Some individuals may experience contact dermatitis or allergic reactions to formaldehyde-releasing preservatives. If you have a history of formaldehyde sensitivity or notice irritation, choosing products with alternative preservatives is advisable. Otherwise, standard cosmetic use poses minimal risk.
Methylene Glycol and trying to conceive
Caution Advised
- Fertility effects
Methylene glycol is a formaldehyde-releasing preservative used in cosmetics. While specific data on topical cosmetic use during conception attempts is limited, formaldehyde's reproductive toxicity classification warrants a precautionary approach. High-level occupational formaldehyde exposure has been associated with fertility concerns in some studies, though topical cosmetic exposure is significantly lower. Many fertility specialists recommend minimizing exposure to formaldehyde-releasing ingredients as a precautionary measure when trying to conceive, though the actual risk from cosmetic products is likely minimal. Choosing formaldehyde-free alternatives is a reasonable precaution during this period.
Methylene Glycol and PCOS
Safe to Use
Methylene glycol is a preservative that prevents microbial growth in cosmetic products. It does not have hormonal activity or effects on androgen metabolism relevant to PCOS. There is no evidence that topical formaldehyde-releasing preservatives affect hormone levels, insulin sensitivity, or other PCOS-related parameters. The ingredient functions purely as an antimicrobial agent without endocrine-disrupting properties. For women with PCOS, the main consideration is individual skin sensitivity. If you experience irritation or allergic reactions to formaldehyde-releasing ingredients, alternative preservatives are available. Otherwise, this ingredient does not interact with PCOS pathophysiology.
Methylene Glycol and general use
Safe to Use
- Irritant
- Common allergen
Methylene glycol is widely used as a preservative in cosmetics to prevent contamination and extend product shelf life. It releases small amounts of formaldehyde, which provides antimicrobial benefits. The primary concern for the general population is contact sensitization in susceptible individuals. According to the SCCS, formaldehyde and its releasing agents can cause allergic contact dermatitis in sensitized persons, though this affects a relatively small percentage of users. The EU restricts formaldehyde content to safe levels in cosmetics. For most people without formaldehyde sensitivity, topical products containing methylene glycol are well-tolerated. If you experience irritation, redness, or itching, discontinue use and select products with alternative preservatives. Regular users with no adverse reactions can continue using products containing this ingredient.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of Methylene Glycol, 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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