Ingredient

Methylisothiazolinone

Potent preservative that became the 'Contact Allergen of the Year' in 2013. Now restricted in leave-on products in EU.

Methylisothiazolinone is a powerful biocide used in rinse-off products at ≤0.0015% to prevent microbial spoilage. Its use in leave-on cosmetics is restricted in many regions due to sensitisation concerns.

Also known as

MIMITMIT preservative2-Methyl-4-isothiazolin-3-oneNeolone

Categories

preservative
Pore Clogging

Low concern

Methylisothiazolinone has a low comedogenic rating and is unlikely to clog pores.

Fungal Acne

Low concern

Methylisothiazolinone is considered safe for fungal-acne-prone skin.

Pregnancy

Some caution

Methylisothiazolinone may require caution during pregnancy. Consult your doctor. Reason: high-sensitising preservative with restricted use.

Irritation

Higher concern

Methylisothiazolinone is commonly associated with skin irritation or sensitisation. Reason: high-sensitising preservative linked to allergic contact dermatitis.

Common Questions

What is Methylisothiazolinone used for?
Potent preservative that became the 'Contact Allergen of the Year' in 2013. Now restricted in leave-on products in EU.
Can Methylisothiazolinone clog pores?
Methylisothiazolinone has a low comedogenic rating and is unlikely to clog pores.
Is Methylisothiazolinone fungal acne safe?
Methylisothiazolinone is considered safe for fungal-acne-prone skin.
Is Methylisothiazolinone commonly irritating?
Methylisothiazolinone is commonly associated with skin irritation or sensitisation.

Educational purposes only. Always consult a dermatologist for personalised guidance.