SPF Scout · Ingredient

Methylisothiazolinone

Preservative (inhibits microbial growth)

CAS 2682-20-4

EU regulatory status

  • Prohibited in cosmetic products in the EU

    Prohibited in leave-on products (incl. sunscreen) — Reg. (EU) 2016/1198; rinse-off restricted to 15 ppm by Reg. (EU) 2017/1224. Driven by a contact-allergy epidemic.

    Listed effective date: 2017-02-12

This status describes European Union cosmetics law — which substances may be used in cosmetic products sold there, and under what conditions. Regulations differ by region. It is not a statement about any specific product, and it does not predict whether your skin will react.

What this ingredient generally does

This is a preservative. It keeps the product from spoiling as microbes try to grow in it.

Reviewed before publication. This note describes function in a formulation — nothing else.

Published formulations that list this ingredient

These are the formulations currently published in the SPF Scout catalog whose stored ingredient declaration includes this ingredient. It is not a list of every product on the market, and the order carries no meaning.

Checking this against your own list

You can select this ingredient in the SPF Scout app as one to flag. The app compares your selections against a product's stored declaration on your device; your list never reaches this website.

This comparison does not predict whether your skin will react.

Where this information comes from

Ingredient names, CAS numbers and recorded functions come from SPF Scout’s curated ingredient dictionary, grounded in CosIng, the European Commission’s Cosmetic Ingredient Database. Content © European Union, reused with acknowledgement.

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