Isododecane

Isododecane 1
molecular structure · PubChem CID 23459
AKA: 2-Methylundecane, 7045-71-8, Undecane, 2methyl
Synthetic
Emollient
Fragrance
Solvent
Skin Conditioner
Clean
2,2,4,6,6-Pentamethylheptane; Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated
Formula
C12H26
Mol. Weight
170.33
CAS #
31807-55-3, 93685-81-5, 13475-82-6
Form
Liquid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Perfuming
Added for scent. Can be natural or synthetic. Common irritant and allergen — one of the top reasons people react to products.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Locks In Moisture
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not Phototoxic
Human test found no phototoxicity in the CIR safety assessment (CIR 579)
Not Comedogenic
Animal test found no comedogenicity in the CIR safety assessment (CIR 579)
Not a Sensitizer
10 studies / 10 not sensitizing (CIR 579)
Mixed Eye Irritation Results
4 studies / 1 irritating / 3 not irritating (CIR 579)
Mixed Skin Irritation Results
14 studies / 3 irritating / 11 not irritating (CIR 579)
Concentration Guide
Leave-on0.008–90%
Rinse-off0.06–83%
0%50%100%
CIR reported use · 2010 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR