Tosylamide/Formaldehyde Resin

AKA: Tosylamide Formaldehyde Resin, Nail Polish Resin

Allergen Warning

⚠️ Formaldehyde

Plant-Derived Synthetic

Occlusive

Not Clean

Benzenesulfonamide, 4-methyl-, polymer with formaldehyde

CAS #

25035-71-6

Functions

Film Forming

Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.

Plasticiser

Anti-Inflammatory

Moisturizing

Fights Acne

Creates protective layer

Adds flexibility

Traditional Use

Developed in the early 20th century as a synthetic film-forming agent. First used in nail polishes in the 1920s to create a hard, glossy finish and improve wear resistance.

EWG

CIR

Safe as used

Pregnancy

Restricted By

Credo Beauty Sephora Clean at Sephora Target Clean Whole Foods Premium Body Care The Detox Market Ulta Conscious Beauty Beauty Heroes CVS Clean Beauty MADE SAFE EWG VERIFIED

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

The paper trail

🔬Peer-reviewed1 paper →

⚖️Regulatory1 listing →

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

Verified Jun 2026

Data: CosIng · EWG · CIR