Welcome to MI Free


MI Free is a resource for information about allergy to the preservative methylisothiazolinone (MI) and its relatives, such as methylchloroisothiazolinone (MCI), which are found widely in cosmetics, toiletries, household cleaning products and other domestic products such as paints.

Increasing numbers of consumers worldwide are developing serious and debilitating allergies to these ‘isothiazolinone’ preservatives, and the epidemic shows little sign of slowing down.

Those with allergy to MI often struggle to find what they need – such as lists of safe products, how to obtain a medical diagnosis or help with their problem, and information on the labelling of isothiazolinone preservatives on consumer products. This site aims to answer those questions. 

To navigate the site, use the drop-down menu at the top. For some of the most popular and recent articles, see below.


Are Products for Sensitive Skin Safe? 
The word ‘sensitive‘ appearing on a cosmetic or household cleaning product does not necessarily guarantee it is safe for MI / MCI allergy – or for that matter any allergy. And the same can be said for ‘natural‘, ‘organic‘, ‘skin kind‘, ‘gentle‘ or ‘hypoallergenic’.




PPD Allergy and MI Allergy
If you’re looking to dye your hair and you have an allergy to MI – and to other ingredients, such as PPD, TDS, fragrances and artificial colours – you need to tread very carefully with the dye or colour you choose. 



Fragrance-Free-Shampoo-425f729_main-2Methylisothiazolinone Free Shampoo
One of the most sought-after MI-free products is shampoo, as so many high-street brands use this preservative in their formulations. Here is a listing of a number of safe products. 




colgate2 copyWhat other names are there for MI?
You won’t always see the word ‘methylisothiazolinone’ on a product to warn you it’s there – or the names of other isothiazolinones, since each has a variety of names, from chemical to brand names. Here’s a list of the most common – along with some safe ‘false enemies’.