Cyclomethicone
Decode Label flags Cyclomethicone as a moderate concern in cosmetics and personal care (endocrine disruptor). It was not found in any of the 893 published products we have analysed.
The concern
Silicone — D4 & D5 banned in EU wash-off cosmetics; endocrine concern
D4 (cyclotetrasiloxane) is a reproductive toxicant and persistent environmental pollutant. D5 (cyclopentasiloxane) bioaccumulates in aquatic organisms. The EU has banned D4 and D5 in wash-off cosmetics. They are still used in some Indian products. Avoid in hair products and body washes.
Most relevant to
Not found in this catalogue
0 of 893 published products Decode Label has analysed list Cyclomethicone or any of its label synonyms. That describes this catalogue, not the Indian market as a whole. If a product we score lists it, it will appear here and its score will reflect it.
Regulatory position
From the published regulation itself. Each row links to its source.
| Authority | Status | Reference | Scope / limit | Source |
|---|---|---|---|---|
| EU-CosIng | Prohibited CMR | Annex II 1388 | — | View → |
Hazard classification
The concern is environmental persistence (D4/D5 are classified very persistent, very bioaccumulative), not direct human toxicity. The 0.1% cap applies specifically to wash-off products, which release the substance to water.
Identity
- Canonical name
- Octamethylcyclotetrasiloxane; D4
- CAS number
- 556-67-2
- EC number
- 209-136-7
Also appears on labels as
Questions
Is Cyclomethicone safe?
The EU Cosmetics Regulation (EC) No 1223/2009 prohibits Cyclomethicone in cosmetics (Annex II, entry 1388). Why it is flagged: Silicone — D4 & D5 banned in EU wash-off cosmetics; endocrine concern. Decode Label treats it as a moderate concern in cosmetics and personal care. It was not found in any of the 893 published products we have analysed.
How common is Cyclomethicone in Indian packaged products?
Decode Label has not found Cyclomethicone in any of the 893 published products analysed so far. That describes this catalogue, not the Indian market as a whole.
Which authorities have classified Cyclomethicone?
EU — EU Reg. 2018/35 (REACH Annex XVII entry 70) — max 0.1% in wash-off cosmetics.
Is Cyclomethicone restricted or banned anywhere?
Under the EU Cosmetics Regulation (EC) No 1223/2009 (CosIng), Cyclomethicone has 1 prohibited entry. Each is shown with its annex reference and a link to the source in the Regulatory position table.
Who should be most careful with Cyclomethicone?
People who are pregnant; Anyone using this regularly.
Related ingredients
Other entries in the register with the same kind of concern.
Method and limits
- Prevalence counts published products whose decoded ingredient list matches this substance or one of its label synonyms, using the same matching the score itself uses. It describes our catalogue of 893 products, not the Indian market as a whole.
- Presence is not dose. An ingredient list gives order, not quantity, unless the pack declares a percentage. Nothing here estimates how much of this substance any product contains.
- A classification is not a verdict on a product. An agency classifies a substance under defined conditions of exposure; whether that matters in a given food or cosmetic depends on route, concentration and use.
- Last updated. This register entry was last changed on 28 September 2026.
- Corrections. Every figure here is reproducible from the sources named. If something is wrong, tell us and we will correct it and say what changed.