Medium ConcernVegan Evaluator Flag

Cyclopentasiloxane

Decamethylcyclopentasiloxane (D5)

Safety Flags

Endocrine Disruptor

Safety Notes

D5 bioaccumulates in aquatic environment; EU restricted in rinse-off cosmetics; endocrine disruption concern (aquatic); brands should reformulate rinse-off products if above EU limit; leave-on permitted; check if submission is rinse-off

Function & Common Use

Function

Solvent / Emollient / Carrier for silicones

Concentration Limits

India (CDSCO)

No formal limit

EU Cosmetics Reg.

Max 0.1% in rinse-off (EU from Jan 2020)

US FDA (21 CFR)

No specific 21 CFR cosmetic limit identified in source checked; EU limit reference: Max 0.1% in rinse-off (EU from Jan 2020)

Korea (MFDS)

No specific MFDS limit identified in source checked; verify if ingredient is used in a Korean functional cosmetic category

Format restriction: Rinse-off: max 0.1% EU; Leave-on: permitted

Baby restriction: Avoid in baby rinse-off

Pregnancy: Caution during pregnancy; endocrine disruption data; precautionary avoidance of high-frequency leave-on use.

Frequently Asked Questions

Is Cyclopentasiloxane safe to use in skincare?

Cyclopentasiloxane has a Medium concern rating. D5 bioaccumulates in aquatic environment; EU restricted in rinse-off cosmetics; endocrine disruption concern (aquatic); brands should reformulate rinse-off products if above EU limit; leave-on permitted; check if submission is rinse-off

Is Cyclopentasiloxane allowed in India?

Cyclopentasiloxane is currently classified as "Permitted" under Indian cosmetics regulations. The maximum permitted concentration is No formal limit.

What is Cyclopentasiloxane used for in cosmetics?

Cyclopentasiloxane functions as: Solvent / Emollient / Carrier for silicones. It is commonly found in: Hair conditioners, serums, sunscreens.

Is Cyclopentasiloxane safe for babies?

Cyclopentasiloxane has baby/child restrictions: Avoid in baby rinse-off. Avoid using products containing this ingredient on infants unless specifically formulated and labelled for baby use.

TCS Assessment

Medium Concern

Data Confidence

Medium

Based on peer-reviewed safety data, regulatory status, and expert review by The Clean Sheet panel.