Methylchloroisothiazolinone and/or methylisothiazolinone in cosmetic products—A market survey

Background

There was a global 'epidemic' of methylchloroisothiazolinone (MCI) and/or methylisothiazolinone (MI) contact allergy from 2009 to 2015. In response, the Thai Ministry of Public Health regulated the use of MCI/MI in cosmetics.

Objective

To survey the presence of MCI/MI and MI alone, as labelled on cosmetics sold on the Thai market, before and after the ministerial directive.

Methods

The presence of MCI and/or MI in leave‐on and rinse‐off cosmetics sold on the market, based on the labelling of ingredients in 3445 products, was analysed.

Results

Before the implementation date, most leave‐on products contained MCI/MI. After the regulations came into force, the only leave‐on cosmetic subcategories that complied with the law were facial skin‐care, sunscreen and make‐up products. MCI/MI and MI alone were found on the labels of both leave‐on and rinse‐off products, the presence of each varying between product subcategories.

Conclusions

Despite the ministerial regulations restricting their use, MCI and/or MI are still found in cosmetics sold on the Thai market. Dermatologists should be aware of this situation, and counsel patients to avoid products containing MCI and/or MI.

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