METHYLCHLOROISOTHIAZOLINONE AND METHYLISOTHIAZOLINONE is graded C (Moderate) by Expert·ING, based on FDA regulatory data. It is restricted under EU COSING (Restricted use).

METHYLCHLOROISOTHIAZOLINONE AND METHYLISOTHIAZOLINONE

Safety grade: C

This preservative is permitted in EU cosmetics with a maximum concentration limit and usage restrictions under EU Cosmetics Regulation (EC) No 1223/2009. To be sold legally in the EU or UK, a product must meet these conditions.

Graded using: FDA.

• EU COSING — Restricted use

Last verified: June 9, 2026