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For informational purposes only — not medical advice. Always consult a dermatologist for skin concerns.

Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI)

1% line markerAI-analyzed

INCI: METHYLCHLOROISOTHIAZOLINONE AND METHYLISOTHIAZOLINONE

preservative

What it does

A highly effective broad-spectrum preservative blend commonly used in rinse-off cosmetic products to prevent microbial growth.

Skin Concerns

No specific concern data available

Safety & Science

Safety summary

Generally considered safe in rinse-off products at low concentrations, but some individuals may experience skin sensitization, especially in leave-on products.

1% line marker

This ingredient is commonly used as a marker to identify where ingredients drop below 1% concentration on the label.

Found In Products

Related Ingredients

At a Glance

INCI Name: METHYLCHLOROISOTHIAZOLINONE AND METHYLISOTHIAZOLINONE
Common Name: Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI)
Functions: preservative
Products: 5 products

For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.

Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI) — Skincare Ingredient Guide — Dermasift — Dermasift