Ingredient
Methylchloroisothiazolinone
A preservative used in a fixed mixture with methylisothiazolinone, permitted in the EU in rinse-off products only.
- Preservative
What it is there to do
Preservative
Keeps the product free of microbial growth in use.
Where this comes up
The notes BeautySignal puts beside this ingredient when it is on a label.
- Subject to a regulatory restriction
One or more ingredients in this product are restricted in at least one market. The restriction is usually a concentration limit or a limit on the type of product.
Why we mention it
Points at a named instrument rather than implying a general hazard. The specific provision is shown with the ingredient.
What the rules say
Each line names the rule it comes from. A limit is not a warning.
EU · Restricted
Regulation (EC) No 1223/2009, Annex V, entry 39
What it sets out
Where it applies: Rinse-off products only
Maximum 0.0015 % of a 3:1 mixture with methylisothiazolinone. Packs don't print concentrations and we hold none, so no page here measures a product against it.
What we don't know
- Where it comes from — plant, mineral, synthetic — isn't recorded.
- How much of it is used in any particular product. We hold no concentrations at all.
Also written as
- MCI
- Methylchloroisothiazolinone and Methylisothiazolinone
This is information about an ingredient, not medical advice, and not a judgement about any product that contains it. Back to the reference.