Ingredient
Cyclomethicone
Cyclomethicone is flagged for pregnancy and trying to conceive. The concern behind the strongest flag is endocrine disruptor.
- Cyclopentasiloxane
- D5
- Cyclotetrasiloxane
- D4
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
- 0 of 5
- Higher means more likely to sting or redden
Cyclomethicone and pregnancy
Caution Advised
- Endocrine disruptor
Cyclomethicone refers to cyclic siloxanes, primarily D5 (cyclopentasiloxane) and D4 (cyclotetrasiloxane), which are silicone compounds used to create a lightweight, smooth texture in cosmetics. These volatile silicones evaporate from the skin after application, though some absorption does occur. The European Chemicals Agency (ECHA) has classified these compounds as substances of very high concern due to potential endocrine-disrupting properties observed in animal studies. Studies in rodents showed reproductive and developmental effects at high doses, including effects on fertility and offspring development. While human exposure from cosmetics is significantly lower than the doses used in animal studies, the endocrine disruption concern leads many doctors to recommend a precautionary approach during pregnancy. There is no explicit prohibition from ACOG or the FDA regarding cyclic siloxanes during pregnancy, but the EU's SVHC classification and environmental restrictions reflect regulatory concern about these compounds. Many obstetricians and dermatologists suggest that pregnant women may want to choose products without these ingredients when alternatives are available, particularly given the precautionary principle for potential endocrine disruptors during fetal development.
Cyclomethicone and breastfeeding
Safe to Use
Cyclomethicone compounds (D4 and D5) are volatile silicones that largely evaporate from the skin surface. While they can be absorbed to some degree, their volatile nature means they are also exhaled from the body, limiting accumulation. Studies on breast milk contamination with cyclic siloxanes have produced mixed results. Some research has detected low levels of D5 in breast milk, while other studies found minimal or no detection. The CIR Expert Panel noted that while these siloxanes are detected in some tissues, their volatile nature and metabolism limit bioaccumulation. The concern during breastfeeding is lower than during pregnancy because potential endocrine effects would primarily impact the developing fetus rather than a breastfed infant receiving minimal exposure through milk. Most dermatologists do not specifically restrict cyclic siloxane use during breastfeeding, though some women may choose to minimize exposure due to the ongoing regulatory and environmental concerns. The ingredients are not on standard lists of substances to avoid while breastfeeding, unlike pregnancy, where the precautionary principle is more strongly applied.
Cyclomethicone and postpartum
Safe to Use
- Environmental pollutant
For postpartum women not breastfeeding, cyclomethicone presents the same considerations as for the general population. These silicones provide excellent sensory properties, creating a silky, non-greasy feel that many find pleasant in skincare and makeup products. The primary concern with cyclic siloxanes is environmental rather than personal health for non-pregnant, non-breastfeeding adults. These compounds do not readily biodegrade and persist in aquatic environments, which is why the EU has implemented restrictions. From a personal health standpoint, the endocrine disruption concerns observed in animal studies are at doses far higher than cosmetic exposure, and there are no specific postpartum health concerns.
Cyclomethicone and trying to conceive
Caution Advised
- Fertility effects
- Endocrine disruptor
Cyclomethicone (D4 and D5) has been studied for reproductive effects due to its classification as a potential endocrine disruptor by ECHA. Animal studies have shown effects on fertility and reproductive organs at high doses, which is the basis for regulatory concern. For women trying to conceive, the precautionary principle suggests minimizing exposure to suspected endocrine disruptors. While human studies at cosmetic exposure levels have not demonstrated fertility effects, and the CIR Expert Panel has deemed these ingredients safe for cosmetic use, women actively trying to conceive may choose to avoid them given the reproductive toxicity observed in animal studies. This is consistent with the general recommendation to reduce potential reproductive toxin exposure during the conception period.
Cyclomethicone and PCOS
Safe to Use
- Endocrine disruptor
Cyclomethicone compounds (D4 and D5) have been studied for potential endocrine-disrupting properties, which raises theoretical concerns for women with PCOS, a condition characterized by hormonal imbalance. However, the evidence for endocrine disruption in humans at cosmetic exposure levels is not conclusive. Animal studies showing reproductive effects used doses substantially higher than human cosmetic exposure. While ECHA has classified these compounds as endocrine disruptors, this classification is based on environmental persistence and animal data rather than demonstrated effects in humans at typical use levels. There are no specific studies examining cyclic siloxanes and PCOS symptoms or progression. Women with PCOS who are particularly concerned about endocrine disruptors may choose to avoid these ingredients as a precautionary measure, though there is no direct evidence linking cosmetic use of cyclic siloxanes to worsened PCOS symptoms. Many dermatologists treating PCOS-related skin issues do not specifically restrict these ingredients, as the primary focus is on addressing androgen-related skin concerns.
Cyclomethicone and general use
Safe to Use
- Environmental pollutant
Cyclomethicone typically refers to cyclic siloxanes, primarily D5 (cyclopentasiloxane) and sometimes D4 (cyclotetrasiloxane). These are volatile silicone compounds prized in cosmetics for creating a luxurious, silky texture that spreads easily and dries quickly without leaving a heavy or greasy feel. The safety profile for general adult use is well-established, with the CIR Expert Panel concluding these ingredients are safe in cosmetics. Dermal irritation and sensitization are extremely rare. The primary concerns are environmental: cyclic siloxanes do not readily biodegrade and persist in aquatic ecosystems, leading to bioaccumulation. This environmental concern, rather than direct human health risk, has driven EU restrictions on D4 in wash-off products. The EU restricted D4 to 0.1% or less in rinse-off products as of 2020, and D5 is under ongoing review for similar restrictions. In North America, these ingredients remain widely used, though many manufacturers are reformulating to phase them out due to environmental concerns. For consumers, the choice often comes down to environmental values rather than personal health concerns, as the risk of adverse health effects from cosmetic use is considered low by most regulatory bodies.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of Cyclomethicone, each one with its own page here.
Cyclomethicone is itself suggested as the safer option on these pages.
- Methyl Perfluorobutyl Ether
- Perfluorohexane
- Polyperfluoromethylisopropyl Ether
- Perfluorononyl Dimethicone
- Perfluoromethylcyclopentane
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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