I have often written about the rarity of finding methylisothiazolinone or methychloroisothiazolinone in bars of soap, and regularly reassure those with isothiazolinone allergies that they are almost certainly safe.
Two Dettol soap bars available in the UK — Dettol Original Soap bar and, more shockingly, Dettol Sensitive Bar Soap* — both contain the MI / MCI blend, sometimes known as Kathon CG.
The ingredients of the Dettol Sensitive Bar Soap (pictured) — click here and scroll down — are particularly inexplicable for a product bearing the words ‘gentle on your skin’.
As well as the isothiazolinones, there are a number of fragrance allergens, including alpha isomethyl ionone, which I have written about before.
I cannot conceive of how this product can be considered appropriate to be marketed in this way.
I don’t know whether this is a new formulation, or a long-standing product of which I had not been aware. Does anyone know?
I have written to Dettol expressing my concern, and will keep you updated with their response.
I am uncertain of the availability or formulation of these products in other countries. I understand Dettol is sometimes branded Lysol in the US, and perhaps elsewhere. Can readers in other territories in a good position to check perhaps volunteer to do so, and let me know, either through comments below or via email?
Further updates to this article when I know more from either a UK or international perspective.
* February 28th Footnote: Despite an email, and a follow-up, I have received no response from Dettol / RB, although during the last few weeks the ingredients of the Dettol Sensitive Bar Soap have been changed, and no longer show MI / MCI.