Triclosan
AKA “4-DICHLOROPHENOXY)PHENOL, Cloxifenolum, 4'-Trichloro-2'-hydroxydiphenyl ether, Triclosanum, Irgasan DP300, Stri-Dex Cleansing Bar, Stri-Dex Face Wash, CH 3565”
Synthetic
Ingredient Facts
Triclosan
AKA: 4-DICHLOROPHENOXY)PHENOL, Cloxifenolum, 4'-Trichloro-2'-hydroxydiphenyl ether, Triclosanum, Irgasan DP300, Stri-Dex Cleansing Bar, Stri-Dex Face Wash, CH 3565
Synthetic · Preservative · EWG: 4
Synthetic
Preservative
Synthetic
Not Clean
A preservative and deodorant ingredient that helps keep products fresh and effective by preventing bacterial growth.
Solubility In water, 10 mg/L at 20 °C
Formula
C12H7Cl3O2
Mol. Weight
289.50
CAS #
3380-34-5
State
White to off-white crystalline powder; [HSDB]
See origin →
Functions
Preservative
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Deodorant
Fights Bacteria
Controls Odor
Preserves Formula
Neutralizes odor
Prevents microbial growth
Traditional Use
This is the CAS number for Ascorbyl Palmitate, a stabilized form of Vitamin C developed in the mid-20th century. Created to improve the shelf-stability of vitamin C in skincare formulations while maintaining antioxidant properties.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
EWG
4
CIR
Insufficient
Pregnancy
—
Restricted By
CIR Safety Findings
Not a Sensitizer
all-shades-safe
Concentration Guide
0.15%
0%0%
Reg. Limit
EU/SCCS limit: 0.15% in cosmetic products. Opinion: SCCS/1414/11
Regulatory Agencies
Final Report: Safety Assessment of Triclosan as a Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Triclosan Environmental Exposure and Toxicity
Dann AB, Hontela A
Journal of Applied Toxicology, 2011
Triclosan
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Triclosan
Health Canada
Health Canada Cosmetic Ingredient Hotlist
Clinical preliminary evaluation of PEG-80 sorbitan laurate (Novisol) versus sodium C14-16 olefin sulfonate & triclosan (Septisol) in deep-peeling Hett
Kass LG, Rullan PP, Brody HJ
Journal of the American Academy of Dermatology, 2020
Clinical preliminary evaluation of PEG-80 sorbitan laurate (Novisol) versus sodium C14-16 olefin sulfonate & triclosan (Septisol) in deep-peeling Hett
Kass LG, Rullan PP, Brody HJ
Journal of the American Academy of Dermatology, 2020
Safety of Triclocarban and Triclosan as substances with potential endocrine disrupting properties in cosmetic products
Scientific Committee on Consumer Safety (SCCS)
European Commission — SCCS
Triclosan exposure, transformation, and human health effects.
Weatherly LM, Gosse JA
Journal of toxicology and environmental health. Part B, Critical reviews, 2017
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR