Dicetyl Thiodipropionate

AKA: Propanoic acid, Dihexadecyl ester, 3287-12-5, 3'-Thiobispropanoic acid, DIHEXADECYL THIODIPROPIONATE, 1'-dihexadecyl ester
Synthetic
Antioxidant
Not Clean
Dihexadecyl 3,3'-thiobispropionate
Formula
C38H74O4S
Mol. Weight
627.10
CAS #
3287-12-5
Form
Liquid
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
Synthetic antioxidant developed in the 20th century to prevent rancidity in cosmetic oils and emollients. Created to extend shelf life of products containing unstable natural ingredients.
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