Distearyl Thiodipropionate

AKA: Dioctadecyl 3, 3'-thiodipropionate, Dioctadecyl thiodipropionate, Plastanox STDP, Antioxidant STDP, Distearyl 3, Cyanox STDP, Advastab 802, Advastab PS 802
Plant-Derived
Antioxidant
Plant Oil
Not Clean
Dioctadecyl 3,3'-thiodipropionate
Solubility Insoluble in water
Formula
C42H82O4S
Mol. Weight
683.20
CAS #
693-36-7
Form
Wax
Functions
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
Neutralizes Free Radicals
Traditional Use
A synthetic antioxidant developed in the 20th century for cosmetic preservation. Created to prevent oxidative degradation of cosmetic oils and fats, replacing traditional antioxidant methods.
EWG
4
CIR
Reviewed by CIR
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing
🛡️Safety-assessed2 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR