For toddlers and preschoolers (2-5 years), this preservative can cause allergic skin reactions (rashes, redness, itching). Many experts and some governments have limited or banned its use in products that stay on the skin because of these allergy risks. Overall, avoid using it on young children's skin when possible.
Check product labels for the name Methylisothiazolinone or the abbreviation MI and avoid products that list it, especially leave-on items like lotions, creams, and wipes. Prefer products labeled "MI-free" for children. If you must use a product that may contain it, choose rinse-off products (like a quick bath wash) rather than leave-on, avoid using it on broken or eczema-prone skin, and do a small patch test on a tiny area first. If you see any redness, swelling, blistering, or persistent itching, stop use and ask your pediatrician or a skin doctor.
Watch for signs of an allergic reaction (red rash, itching, swelling, blisters). There are published reports of children developing contact dermatitis from baby wipes and expert/government reviews that have recommended restricting or banning this ingredient in leave-on cosmetics. Children with eczema or very sensitive skin are at higher risk. If a product is restricted or banned in your country, do not use it on your child.
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This ingredient has the following documented risks:
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This ingredient may also be listed as:
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This ingredient is found in the following products:
This list shows products that contain Methylisothiazolinone or its alternative names.
Scientific research related to this ingredient:
These research articles provide scientific evidence about Methylisothiazolinone safety and effects.
Methylisothiazolinone is not recommended for 2-5 year old children due to potential safety risks.
Could weaken or confuse immune system. Young children may be more sensitive to these effects.
Linked to triggering or worsening eczema and similar skin conditions. Young children may be more sensitive to these effects.
Can cause skin redness, itchiness, or rashesβespecially on sensitive baby skin. Young children may be more sensitive to these effects.
Banned or heavily restricted in one or more countries. Young children may be more sensitive to these effects.
Methylisothiazolinone is commonly found in skincare products, cosmetics, and topical applications. Always check ingredient labels before use.
The appropriate age depends on the specific ingredient properties and concentration. This analysis is for 2-5 year old children. Use the age selector above to check other ages.
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