Methylisothiazolinone
Ingredient Info
Methylisothiazolinone (MI) is a preservative used in skincare and personal care products to prevent bacterial and fungal growth. It helps extend shelf life and maintain product safety during storage and use.
Benefits
- Prevents microbial contamination in products
- Extends product shelf life
- Allows brands to reduce other preservative systems
Potential concerns
- Known contact allergen — can cause allergic contact dermatitis in sensitive individuals
- Rising rates of allergic reactions reported globally, particularly in North America
- May cause itching, redness, or rash on skin; reactions can be delayed and sometimes severe
- Even at standard test concentrations, up to 50% of allergic cases may go undetected initially
Science: Methylisothiazolinone is a well-documented contact allergen responsible for considerable morbidity in the population. It has been regulated in the European Union due to rising allergic reactions, resulting in a significant drop in cases there, though high rates persist in North America. Recent dermatological literature identifies it as a frequent cause of allergic contact dermatitis warranting closer monitoring and stricter regulatory oversight.
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