Ingredient
Methylisothiazolinone
A preservative restricted in the EU to rinse-off products only. It has not been permitted in leave-on cosmetics since 2017.
- 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 57
What it sets out
Where it applies: Rinse-off products only
Maximum 0.0015 % w/w. Packs don't print concentrations and we hold none, so no page here measures a product against it.
Not permitted in leave-on cosmetic products.
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
- MI
- MIT
This is information about an ingredient, not medical advice, and not a judgement about any product that contains it. Back to the reference.