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Methylisothiazolinone is a powerful synthetic biocide and preservative which is used in numerous personal care products. It is not on the list of allowed preservatives in the EU.
Nevertheless, it is contained in about 7% of all cosmetics products (such as in US products), especially in hair care products and face and shower products.
Danger! According to European Union, this substance is fatal if inhaled, is toxic if swallowed, is toxic in contact with skin, causes severe skin burns and eye damage, is very toxic to aquatic life, is very toxic to aquatic life with long lasting effects, causes serious eye damage and may cause an allergic skin reaction.
Does the SCCS consider Methylisothiazolinone (MI) to be safe for consumers, when used as a preservative in rinse-off products up to concentration limit of 0.01% from the view of induction of contact allergy?
The available data does not support MI as a preservative in rinse-off cosmetic products with a concentration limit of 0.01% from the view of induction of contact allergy. For rinse-off cosmetic products, a concentration of 0.0015% is considered safe for the consumer from the point of view of induction of contact allergy. The available data does not support the safe use of MI as a preservative in leave-on hair cosmetic products up to a concentration limit of 0.01% from the point of view of induction of contact allergy.
Does the SCCS have any further scientific concerns?
The results of a recent Scandinavian study does not support safety of MI in rinse-off products at either 100 ppm or at 50 ppm for elicitation or induction.
