Ingredient · dataset v56
Cyclopentasiloxane and fungal acne
No known trigger
Why it's not a known trigger
A volatile cyclic silicone that evaporates after spreading the formula; silicon-oxygen chemistry, not a fat, matching the neutral dimethicone ruling.
Often paired with dimethicone; D5 is the five-ring, cyclohexasiloxane the six-ring.
Evidence strength
Judged neutral — no trigger evidence
Function
Silicone
Also listed as
D5, Cyclohexasiloxane
Checked products with this ingredient (3)
Product types: Sunscreens
Sunscreens (3)
- CoTZ Face Prime & Protect Non-Tinted SPF40 1.5 oz
- CoTZ Face Prime & Protect Tinted SPF40 1.5 oz
- La Roche-Posay Anthelios AOX Daily Antioxidant Serum SPF 50
Related silicone
- Amodimethicone — No known trigger
- Bis-Isobutyl PEG/PPG-10/7/Dimethicone Copolymer — No known trigger
- Bis-PEG-15 Methyl Ether Dimethicone — No known trigger
- Bis-PEG-18 Methyl Ether Dimethyl Silane — No known trigger
- Caprylyl Methicone — No known trigger
- Cetyl Dimethicone — No known trigger
- Cetyl PEG/PPG-10/1 Dimethicone — No known trigger
- Cyclomethicone — No known trigger
Sources
EU CosIng database — search the INCI name
Last reviewed: 2026-10-13 (dataset v56).
Questions
Does Cyclopentasiloxane trigger fungal acne?
No known trigger: A volatile cyclic silicone that evaporates after spreading the formula; silicon-oxygen chemistry, not a fat, matching the neutral dimethicone ruling.
Does Cyclopentasiloxane feed Malassezia?
No known link: Cyclopentasiloxane is judged with no known trigger. One screened ingredient is not a product verdict — when in doubt, ask a dermatologist.
Is this medical advice?
No. We screen ingredient lists; we never diagnose, treat, or certify products. When in doubt, ask a dermatologist.
Check a full list containing Cyclopentasiloxane →
Not medical advice: we screen ingredient lists for potential triggers — we never diagnose, treat, or certify products. Dataset v56.