Ingredient
Methylchloroisothiazolinone
Preservative usually paired with methylisothiazolinone (MCI/MI). Strong sensitizer.
Methylchloroisothiazolinone is a potent biocide almost always paired with methylisothiazolinone in a 3:1 ratio (Kathon CG) for rinse-off preservation. Concentrations are kept extremely low (≤0.00075%) to minimise sensitisation.
Also known as
Categories
Low concern
Methylchloroisothiazolinone has a low comedogenic rating and is unlikely to clog pores.
Low concern
Methylchloroisothiazolinone is considered safe for fungal-acne-prone skin.
Some caution
Methylchloroisothiazolinone may require caution during pregnancy. Consult your doctor. Reason: high-sensitising preservative with restricted use.
Higher concern
Methylchloroisothiazolinone is commonly associated with skin irritation or sensitisation. Reason: high-sensitising preservative linked to allergic contact dermatitis.
Common Questions
What is Methylchloroisothiazolinone used for?
Can Methylchloroisothiazolinone clog pores?
Is Methylchloroisothiazolinone fungal acne safe?
Is Methylchloroisothiazolinone commonly irritating?
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Educational purposes only. Always consult a dermatologist for personalised guidance.