PLDEFRESITJęzyk: polski
INCI name

METHYLCHLOROISOTHIAZOLINONE

MCI

Preservativereviewed

A preservative used with MI, allowed only in rinse-off products in the EU.

What it is

Methylchloroisothiazolinone (MCI) is an isothiazolinone preservative, used in a fixed mixture with methylisothiazolinone (MI). It is a known contact allergen.

Where it is used

Found in some shampoos, shower gels and liquid soaps.

Limits of interpretation

The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.

In the EU the MCI/MI mixture is allowed only in rinse-off products, at up to 0.0015%; see the EU regulation section.

Functions

Preservative
Exclusively or mainly intended to inhibit the development of micro-organisms in the cosmetic product. All authorised preservatives are substances in the positive list of Annex V to the Cosmetics Regulation 1223/2009.

EU regulation

EU · Annex V, entry 39Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
Product type
Rinse-off
Maximum concentration
0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
As of
3 November 2026 · (EC) 2014/1003

Safety Gate alerts (EU)

78 alerts about dangerous cosmetics in the EU mention this substance. An alert concerns a specific product, usually one that breaks EU rules.

See all alerts →

Products with this ingredient (536)

Check a full ingredient list