Why Are Some Preservatives Linked to Allergies and Skin Sensitivity?

Not all preservative discussions are about formaldehyde. Another group of preservatives that has received significant attention from dermatologists and regulators is known as isothiazolinones. Common examples include:

These preservatives are used to prevent the growth of bacteria, mold, and other microorganisms in water-based products. As their use increased, dermatology clinics in many countries reported a growing number of allergy cases linked to these ingredients. This led to increased scrutiny and restrictions in certain product categories.

What is it?

Isothiazolinones are preservatives used to prevent microbial growth in water-based products.
Did You Know

• An ingredient can be effective at preserving a product while still causing irritation or allergic reactions in sensitive individuals.
• Methylisothiazolinone (MI) was once referred to by dermatologists as an “Allergen of the Year” after a sharp increase in allergy cases was reported.
Cleaning Vs. The Feeling of Clean

Preservatives are not added to improve cleaning performance. Their job is to protect the product itself.
Label Decoder

Look for:
• Methylisothiazolinone (MI)
• Methylchloroisothiazolinone (MCI)
• Benzisothiazolinone (BIT)