CYCLOTETRASILOXANE
CYCLOTETRASILOXANE
Synthetic silicone with low molecular weight. Acts as an emollient and solvent in cosmetic formulations, particularly for skin and hair care.
Skin conditioningEmollientProhibited in the EUSuspected CMREndocrine disruptor (suspected)
Ingredient
Roles & functions
Skin conditioning — Keeps the skin in good condition and protects it; improves its comfort.
Emollient — Softens and smooths the skin while limiting water loss.
Hair conditioning — Improves the appearance, softness and manageability of the hair.
Solvent — Dissolves other ingredients to incorporate them into the formula.
Regulatory framework
What the authorities say
| Authority | Status |
|---|---|
| Commission européenne (CosIng, Règl. 1223/2009) | Interdit (Annexe II) — Octamethylcyclotetrasiloxane; D4 |
| Classification CLP harmonisée (ECHA, Annexe VI Règl. 1272/2008) — maj Fri, 07 Aug 2026 16:37:29 GMT | Reprotoxique — suspecté |
| Endocrine Disruptor Lists (autorités UE, edlists.org) — maj Fri, 07 Aug 2026 16:37:31 GMT | Perturbateur endocrinien — suspecté |
| ECHA — Candidate List of substances of very high concern (SVHC, REACH Art. 59) — maj Fri, 17 Jul 2026 12:03:10 GMT | Identified as SVHC on the basis of PBT / vPvB (persistence, bioaccumulation) — Candidate list since June 27, 2018 |
| European Commission (Reg. 1223/2009, Annex III) | No cosmetic allergen subject to mandatory labelling |
| European Commission (EU catalogue of nanomaterials, Reg. 1223/2009) | No referenced nanoform |
| European Commission — Annex II (Reg. 1223/2009) — maj Fri, 07 Aug 2026 16:37:22 GMT | Prohibited in cosmetics (Annex II) — Octamethylcyclotetrasiloxane; D4 — Annexe II, entrée 1388 |
Last verified :
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This information is reported factually and with attribution (authorities and publications cited). It does not constitute medical advice, for your situation, ask a pharmacist or a healthcare professional for advice.
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