Zinc Undecylenate

AKA: 557-08-4, Zinc undecenoate, UNDECYLENATE ZINC, ZINC UNDECENOATE (MART.), ZINC UNDECENOATE [MART.], ZINC UNDECYLENATE (EP MONOGRAPH), ZINC UNDECYLENATE [EP MONOGRAPH]
Synthetic
Preservative
Not Clean
OriginSynthesized from zinc oxide and undecylenic acid, both industrially produced compounds. Created through direct chemical reaction between zinc oxide and undecylenic acid to form the zinc salt.
Zinc Undecylenate is a natural or synthetic fungistatic fatty acid, antifungal Zinc Undecylenate is used topically in creams against fungal infections, eczemas, ringworm, and other cutaneous conditions. The zinc provides an astringent action, reducing rawness and irritation. (NCI04)
Formula
C22H38O4Zn
Mol. Weight
431.90
CAS #
30773-48-9, 557-08-4
Form
Powder
State
Dry Powder
Skin Types
●all-skin-types
Best For
Acne
Pregnancy & Breastfeeding Safe
Yes
Functions
Anticaking
Antimicrobial
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Opacifying
Fights acne
Causing bacteria
Quells irritation
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.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Mixed Skin Irritation Results
3 studies / 1 irritating / 1 mixed / 1 not irritating / reactions slight (CIR 755)
Concentration Guide
Leave-on0.25%
Rinse-offNot reported
0%50%100%
CIR reported use · 2016 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR