Beauty ingredient · Silicone
Cyclopentasiloxane (D5)
- CAS
- 541-02-6
A volatile cyclic silicone used in hair serums, antiperspirants and primers.
- Cyclic silicone (D4/D5/D6)
- Silicone
- Expert review pending
Concern level
Strong evidence of harm at high intake, emerging evidence of harm, or a common allergen or irritant. The concern level sets how many points Cyclopentasiloxane (D5) costs on a product’s receipt.
What the evidence says
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Very persistent in the environmentRegulatory
Restricted in the EU (0.1%) in wash-off cosmetics since 2020 and in other cosmetics from 6 June 2027 because they persist and build up in the environment. [1][2]
Evidence tiers say how sure the evidence is, separately from how much it matters. About evidence tiers.
Rules around the world
| Where | Status | Details | Date | Source |
|---|---|---|---|---|
| European Union | Restricted | Below 0.1% in wash-off cosmetics since 31 January 2020; in all other cosmetics after 6 June 2027. | — | [2] |
“Banned” means explicitly prohibited or withdrawn after review; “not permitted” means never authorized there. We use each regulator’s own words.
Popular products that list Cyclopentasiloxane (D5)
6 of the 17,000 most-scanned products in the US with a GoodSwap page list Cyclopentasiloxane (D5).
- Old Spice Swagger Old Spice Score 85 out of 100 Excellent
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Daily Moisturising face SPF 50+ Bondi Sands · 75 mL Score 73 out of 100 Good -
Degree Men Black and white Unilever Score 88 out of 100 Excellent -
Dove Men Dove Score 88 out of 100 Excellent -
Dove Women Cool Essentials Spray Dove Score 85 out of 100 Excellent -
Ultra max Arm & Hammer Score 82 out of 100 Excellent
Names GoodSwap recognizes on labels (4)
- d5
- cyclopentasiloxane
- cyclopentasiloxane d5
- decamethylcyclopentasiloxane
Sources
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“Shall not be placed on the market in wash-off cosmetic products in a concentration equal to or greater than 0,1 % by weight of either substance, after 31 January 2020.”
eur-lex.europa.eu
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“for all cosmetic products other than the ones mentioned in paragraph 3(a), paragraph 1 shall apply after 6 June 2027”
eur-lex.europa.eu