Know Your Ingredients: Methylchloroisothiazolinone

by beautifulwithbrains on May 8, 2010

in ingredients

What it is
Methylchloroisothiazolinone belongs to a group of compounds called Isothiazolinones.

What it does
Methylchloroisothiazolinone is a preservative: it protects products from the growth of fungi, bacteria and yeast, thus prolonging their shelf life.

Side effects
Methylchloroisothiazolinone is an irritant and a strong allergen. Because of that, it is mostly used, in small concentrations, in rinse-off products so the chances of it causing negative reactions are much smaller.

{ 4 comments… read them below or add one }

Trisha May 8, 2010 at 8:38 pm

Why kinds of things would you find this in?
.-= Trisha´s last blog ..Ultimate Beauty Day 4: Try Something New Today =-.

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beautifulwithbrains May 9, 2010 at 7:12 pm

Trisha, this preservative can be found pretty much in all kind of products: makeup, skincare, shampoos, bath products and suntan products.

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Sheri December 28, 2010 at 4:18 am

I’m searching for beauty products that DO NOT contain Isothiazolinones and having a difficult time. Do you know of any websights that would list such products?

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beautifulwithbrains December 28, 2010 at 4:52 pm

Sheri, unfortunately I don’t know such websites but I know that some online retailers like drugstore.com and ulta.com list the ingredients of most of the products they sell. You can just search for a product you’re interested in buying on there and see if it contains Isothiazolinones. I’m sorry I couldn’t be of more help.

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